If we break this down by stroke, we find some interesting results. I've taken the percentage changes from the WRs of 50s, 100s and 200s of all 4 strokes and compared the total effect.
Freestyle - 7.108% (50 - 3.373%, 100 - 1.944%, 200 - 1.791%)
Backstroke - 7.110% (50 - 3.065%, 100 - 1.963%, 200 - 2.082%)
Breaststroke - 3.733% (50 - 1.876, 100 - 0.930%, 200 - 0.926%)
Butterfly - 3.977% - (50 - 2.308%, 100 - 1.151%, 200 - 0.517%)
Freestyle - 6.164% (50 - 1.658%, 100 - 2.308%,200 - 2.199%
Backstroke - 6.977% (50 - 3.677%, 100 - 2.221%, 200 - 1.090%)
Breaststroke - 2.965% (50 - 1.683%, 100 - 0.983%, 200 - 0.299%)
Butterfly - 4.861% (50 - 1.026%, 100 - 0.972%, 200 - 2.863%)
From these figures it appears that, in terms of WRs being broken, the suits benefited male and female Backstrokers and Freestylers significantly more than they did male and female Breaststroke and Fly swimmers. I predict that the WRs in the Women's Breaststroke events especially could be at risk in 2010 suits sooner than many would expect.
I predict the first 5 Individual WRs to be broken in the near(ish) future
Women's 1500m Freestyle - 15:42.54 - Kate Ziegler set her mark in a non Polyurethane suit and so this has to be the favourite for the first WR to go with 2010 suits.
Women's 200m Breaststroke - 2:20.12 - Annamay Pierse was only 0.299% (0.38 secs) under Leisel Jones non-Poly mark. With Jones, Soni and Pierse driving each other on, this WR is a definite possibility.
Women's 800m Freestyle - 8:14.10 - Rebecca Adlington was just 0.427% (2.12 secs) under Janet Evans' 1989 mark. Judging by Adlington's sub 4:00 SC time at Duel in the Pool in a 2010 suit I think her current WR in this event under threat.
Men's 200m Butterfly - 1:51.51 - Michael Phelps only bettered his non-Poly WR by 0.517% (0.58 secs). Who would put it past Phelps to be the first swimmer to break a Polyurethane WR in a 2010 suit? Not me.
Men's 1500m Freestyle - 14:34.56 - One of the truly historic WRs in world swimming. Grant Hackett's ridiculous mark from 2001 was one of only 2 WRs to survive the Polyurethane onslaught. Some have predicted that this mark will remain well into this decade, but with the chasing pack including Mellouli, Cochrane, Park, Zhang and Prilukov this will be a record they will be desperate to beat.