The UK has become very strict about NOT stamping the passports of travelers with Advance Entry Clearances nowadays. I have been succesful getting my passport stamped only 1 out of 8 trips to London in the past year, despite multiple conversations with immigration supervisors.

I would much rather people stamped on a clean page than throw stamps one on top of the other like European airports often do. I have a few pages in my passport that are almost totally indecipherable now.

Those stamps arent too bad. Have worse in my passport - eg Mexican stamp which can only make out the outline and nothing else, some asian stamps double and triple on top of each other.

I prefer they find a blank page and just stamp it, rather than stick 10 or 12 stamps on a passport, they will stamp over other stamps, which is annoying, as I am trying to fill up my damaged Singapore passport ASAP, as it is not due for replacement until 2009, even though it was initially issued for 2 1/2 years because I have not yet done NS, they will not issue a fresh one, and insist you renew it until 10 years have passed.

My experience with a Dutch passport:

Canada and US always stamp on entry only
Mexico stamps on entry only (if you travel beyond border zone)
Cuba doesn't stamp
all other Latin American countries stamp on entry and exit

the 5 African nations I have been to (Morocco, Egypt, Ethiopia, Cameroon and South Africa) stamp on entry and exit

"old" EU (member before 2004), Norway, Switzerland do not stamp
"new" EU does sometimes stamp on entry, sometimes on exit, sometimes on entry and exit, sometimes not at all
other Europe (Russia, Ukraine) stamp on entry and exit

Asia: always stamp on entry and exit (and they carefully match entry and exit stamps)
China also stamps during transfer (international to international via Beijing in my case)

Australia stamps on entry and exit

When my wife and I crossed from Austria into the Czech Republic, I got a stamp and she didn't, even though we were sitting next to each other in the same car. I think it had something to do with the fact that she has a very Czech name, and mine isn't. The border guard seemed to almost be welcoming her home, so maybe they don't do it for people they think live there.

I haven't got any messy pages like that at all. In fact, the 'new EU' countries in particular used to always stamp very neatly (always start methodically at the front or back, stamp squarely in the corner, then sequentially).

Looking through, though (as a UK citizen):

• Russia stamps on entry and exit (visa slip is separate).
• US stamps on entry, but I have one exit stamp from JFK in 1999. I also have lots of rips from the bloody staples they use for the VWP slip.
• India stamps on entry and exit (with visa).
• Pakistan stamps on entry and exit (with wonderful handwritten visa).
• Lithuania stamps on entry only (pre-EU).
• Poland stamps on entry and exit (pre-EU).
• Malaysia stamps on entry and exit.
• Morocco stamps on entry and exit, plus a serial number (needed for hotels etc.)
• Slovenia stamps on entry only (pre-EU).
• Thailand stamps on entry and exit.
• Canada stamps on entry only.
• Netherlands Antilles stamps on entry only.
• Hong Kong stamps on entry and exit.
• China stamps on entry and exit (with visa).
• Croatia stamps on entry only (pre-EU).
• Bolivia stamps on entry and exit, with a little '30 days' stamp on the side.
• Peru stamps on entry and exit.
• Turkey stamps on entry and exit (with 'bandrol' sticker).
• Latvia stamps on entry and exit (pre-EU).
• New Zealand stamps on entry only.
• Hungary stamps on entry only.
• Czech Republic stamps on entry only.

So that means no stamps from EU countries (as I have permanent leave to remain). Leaving the only other non-EU country not to stamp this passport as Bosnia.

My passport has many visas, but 64 pages is hard to fill. I have:
- Tons of Hong Kong stamps
- 2 Macau SAR stamps
- 5 Chinese visas and stamps
- A Russian visa sticker with entry and exit stamps
- A Australian visa and set of stamps
- Numerous US stamps and a visa and a large number of pages are ripped due to staples.
- A British stamp
- A stamp from Germany entry and exit
- A stamp from France, Entry only
- A Taiwan stamp
- A Belarus visa and stamps
- A Ukraine visa and stamps
- A Mongolian visa with stamps
- 2 Japanese entry and exit stamps
- A set of Thailand stamps
- A Canadian IMM1000, and entry stamp
- A stamp from Dubai
- A stamp from Bahrain
- A stamp from Iran with visa
- A stamp from Saudi Arabia with visa
- A stamp from India with visa
- A Indonesian stamp
- A few Malaysian stamps
- South Korean stamps
I get so many stamps since when I go to Hong Kong I travel in and out a lot, to China, Macau and other SE Asia countries.
Yet I still have 22 pages to go. The stamps are crammed together, making it looked like a stamp-fest.

In terms of places where I have repeat experience, DUB, LHR, and MAD stamp a US passport while CDG does not.

After entering Schengen at CDG countless times (over 100 for sure), I never ever was stamped. Yet recently it happened for the first time. But I think the officer was distracted. She was talking to someone else while reviewing and stamping my passport. However at other French entry points such as LYS and NCE they have always stamped, going back years.

At CDG, it seems that off and on certain officers look at the passports or don't look at them. Often they just wave you through as long as you have a US or European passport. Other countries generally get scrutinized as most of them need a visa for France.