The only info in the 2002-2003 Specialty edition (the one with all the specialties except OMS) that was still correct by the time I started applying last summer was the name of the program (no joke). Program directors changed, addresses and phone numbers were incorrect, number of positions available changed and the stipend part was horribly off b/c GME disappeared for many endo/ortho/perio/prostho programs this year.
ASDA updates those guides every 2 years, so there should be a new edition this year.
However, I'd still encourage you to purchase the ASDA guides if you are an underclassmen and interested in seeing what's out there. It's really the only comprehensive info available, besides the AAPD (pedo) and AAOMS (oral surgery) websites. I used the GPR/AEGD one to get a basic start to locating and visitng programs in NYC, an area I didn't know anything about. I used the specialty book to see what programs were out there and which ones I would consider applying to.