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