Japan-guide.com can be pretty helpful~ Here's their forum:

http://www.japan-guide.com/forum/quedisplay.html

Trip-Advisor:

http://www.tripadvisor.com/Tourism-g...Vacations.html
forum:
http://www.tripadvisor.com/ShowForum...525-Japan.html

For translation services:
rikai.com is a great resource for those annoying kanji

Those are the main ones I can think of for now