Cryptography community/forum?

[guitarscn]

Can anyone recommend a good cryptography forum? I need help decrypting this: http://img716.imageshack.us/img716/3633/crypt.jpg

I've done my best to transcribe the letters:

AGSMFHFMSGALTNOWAZYOMSP
PSMOYEZAWONTLAGSMAPBACE
AZBMCLBPLCMNOPRADCLTCBY
CLYHZPTEPSIQAIKMRADSNET
SYCYAMTMLFAEECSYETBBAY
EHESAELPPOTSOTSITNAWILLA
MICTENLTPKEAMUCHMROEFO
HLAZHBTOYMSUMSLEOFTOUSTZ
AHMEHSCAAPAOOBLOPSOLMO
MLTYEOOHVICLEHOPYBBOSDY
TEYILOYWHNYTEKMTHSMTYIYA
DKDGPONOCEYLOWEOULDOGSY
CDYOMCEOPGOHLSEHKLDELNOEW
HAHESLSNGNTLSETOTEONNE
HIMTASLLAGELWKSAYIOEAR
RE[R]WSDUKALNWOINBTTOUTLE [BACKWARDS R]
IRGREOBSHEHDOYUOZBBYOOK
HAHATEWTUKEHCCYWTZOTME
USOSUEDFYLIKKLZSOYMBT
HPTPESNUOPPCEHOASKOSWT
TEFETSDUMSDALNLCEEHDE
ORORFONWEHYAOUTIDOMLOL
RIPIYHYEEKSNHOEWSDESO

Unfortunately the person who wrote this is deceased so this is a personal matter to me and would like to solve this.

The frequencies of the letters 'o', 'e', 's', and 't' respectively seem to be the most common, so it might be likely that it's a transition cipher.

I have added smaller image, vermaden: