This book will help quite a bit, as will Verstegen's book. You can also check out the Egoscue website, send them pics, and they'll custom design a program to fix your posture. I think it's only 15 bucks, which is a great deal considering a visit to their clinics is like $150 or so.
My mistake, $35 for the custom program, 15 is for a different site service.
If you actually plan to DO IT (the biggest concern with this is compliance vs. laziness), it'll be the best $35 you ever spent (other than the trio of Thai hookers).
How long are typical custom programs? I mean, will it interfere with strength training or anything else? I know the severity of the problem can alter greatly among individuals, but on average how long do you think it'd take?