I fell behind because it gets harder the higher the number you get. I will be doing a few regional tours later this year and that should help rack up the numbers enough to keep me on target for one "new" country (per this passport) a month.

61...but its over 2 passports as I ran...
 

..out of pages.

Canada - I have the Maple Leaf stamp
USA
Mexico
Belgium
Austria

I really need to travel more out of the country

All of the following are since January 2002.
Zambia
Zimbabwe
Argentina
Uruguay
Mozambique
South Africa
England
Botswana
Namibia
Malawi
Chile
Australia
USA
Canada
Thailand
Singapore
Myanmar
Cambodia
Hong Kong
UAE
France
New Zealand
China
St. Maarten
Belgium
Egypt
Macau
Indonesia
Malaysia
Trinidad & Tobago
Costa Rica
Ecuador
Oman
Japan
Ecuador
Azerbaijan
Georgia
Armenia
Russsia
Mongolia

Old Israeli passport:
Israel (before I started using the handprint system)
Macau
Hong Kong
Netherlands
India (plus full-page visa)

Current US Passport:
US
UK
Australia

Current 2-month-old Israeli Passport:
Belgium
Thailand
India (plus full-page visa)
Greece

My current schengen passport (so no european stamps) has the following stamps:

India 2 (in and out)
Canada 10 (including one from immigration canada for my visa)
USA 4

technicaly I could have one more canadian stamp (one time they saw my visa and just gave the passport back to me). I could also have another 2 extra US stamps but since I always keep the I-94W they treat my passport as a canadian or US one.

In my old passport, instead, I have:

England
Australia 2 (in and out)
France
Iceland
Hong Kong (In and out)
USA
Tunisia 2 (in and out I think...I can't read arabic)

Slightly OT, why does the INS stamp US passports? This doesn't happen all the time, but I've seen quite a number of US passports with US stamps in them.