Does anyone know a program or website to practice/drill grammar? I'm looking for something simple like conjugations of verbs and adjectives into their various forms. We have SRS for vocab/sentences etc. there should be something for grammar too.

I've reached a point where not being able to properly conjugate simple and common verbs/adjectives stops being funny and becomes embarrassing. It also hinders my progress because I spend great deal of my private lessons trying to figure out how to make a negative adjective or something stupid like that.

I've looked a little myself and found nothing that comes close, sticky and forum search also didn't give any results.

Wouldn't it be pretty easy to put verbs and adjectives into the SRS and then a target conjugation?

Something like:
Front
行く past polite

Back
行きました .

Maybe this would help? Not sure if it is exactly what you are looking for.

opal.ecis.nagoya n-lab Practice tests

japaneseverbconjugator unfortunately it is only in romaji

I remember this thread had some great links.

http://forum.koohii.com/showthread.php?tid=4905

You can find great materials at the Meguro Language Center (MLC) site. Probably you'll find the conjugation tables particularly useful. Print them and stick them in the wall in your room or somewhere else and give them a look once in a while.