Like 142 says UsTOO is your best bet.
Some chapters are small and they have more difficulty getting guest speakers, but larger ones usually have strong guest lists. I run the las vegas chapter and we have over 300 members. Our meetings typically between 30 and 50 attending. Our attendance has been up lately because of recent press about
a doctor that was reusing tools he wasn't supposed to be reusing in prostate biopsies.
I'm only mentioning as I know you can't attend our meetings but for an example, we have had some very top level presenters this year. Our April meeting will feature a psychosocial oncologist and he will be speaking on issues for couples and also the psychology of diagnosis.
Advanced Prostate Cancer at age 44 (I am 48 now)
pT3b,N0,Mx (original PSA was 19.8) EPE, PM, SVI. Gleason 4+3=7
Da Vinci Surgery ~ 2/16/2007
Adjuvant Radiation Therapy ~ IMRT Completed 8/07
Adjuvant Hormone Therapy ~ 28 months on Casodex and Lupron.