How hard are the top levels of various frequent flyer programs to reach?

Taking the reviews from
http://www.webflyer.com/programs/rat...ws/program.php

and comparing the programs which have their own forums here

Aeroplan Super Elite - 100 000 miles/yeas
Flying Blue Platinum - 70 000 or 90 000 miles/year
Air NZ has air points. Gold Elite - 1500 dollars/year
Airtran A+ rewards has Base Credits. Elite - 50 base credits/year
Alaska Airlines Mileage Plan has MVP Gold - 40 000 miles/year
ANA Mileage Club Diamond Service - 100 000 miles/year
American Aadvantage Executive Platinum - 100 000 miles/year
Asiana Bonus Club has longer qualification periods... requalification is 3 years. Highest level seems to be Diamond, Platinum Club looks like lifetime level.
bmi diamond club Gold - 38 000 miles/year
BA EC has tier points. Gold - 1500 or 800 tier points/year.
CX Asia miles Diamond - 120 000 miles/year
Continental OnePass Platinum - 75 000 miles/year
Delta SkyMiles Platinum - 75 000 miles/year
El Al Matmid has points. Platinum - 5000 points/year
Emirates Skywards Gold - 50 000 miles/year
JAL Mileage Bank Diamond - 100 000 miles/year
Korean Air Skypass Morning Calm - 50 000 miles/year. The higher levels are lifetime only.
Lufthansa Miles & More HON Circle - 600 000 miles in 2 years
Midwest Miles Executive - 20 000 miles/year
Northwest Worldperks Platinum Elite - 75 000 miles/year
Qantas Frequent Flyer has Status Credits. Platinum - 1400 credits/year.
SAS Eurobonus Gold - 55 000 to 100 000 miles/year
Singapore PPS Club - 50 000 miles/year, in business or first only
Thai ROP Gold - 50 000 miles/year
United Mileage Plus Premier Executive 1K - 100 000 miles/year
US Dividend Miles Chairmanīs Preferred - 100 000 miles/year
Varig Smiles Diamond - 100 000 miles/year
Virgin Flying Club has tier points. Gold - 40 points/year.

Any recent changes? Plus, there is probably plenty of details about how class bonuses and segments count.