Wondering if anyone know of any other online dictionaries for Japanese grammar.

The essential resources thread lists: http://www.nihongo2.com/dictionary/dictionary.html
But this weblink is dead.

The other sites I use frequently are
Jgram.org (good, but the entries are full of mistakes) and
renshuu.org (recommended)

How about Tae Kim's guide at: http://www.guidetojapanese.org/learn/grammar ? A lot of people read this as their first introduction to japanese grammar.

Also, the Dicitionary of Basic Japanese Grammar is great if you know what you're looking for. There's also Intermediate and Advanced editions, but I haven't used them yet.

-Jesse

This is a website which I prefer personally. It's really easy to navigate through in comparisom to most grammar websites like Jgram, but unlike Tae Kim it focuses on JLPT order with plenty of examples.

http://www.tanos.co.uk/jlpt/skills/grammar/sentences/

If you try from the main site (nihongo2.com) it still works.
Or you can try the archive.
Niwasaboo's guide is good as well.