As a DYI language learner, I am always looking to take my own path and search out answers to what interests me.  Sometimes this path is shorter, and sometimes, especially in the case of grammar, it can be much, much longer.  So if you are on a similar path, you will be thrilled to know that there is now an online Chinese Grammar Wiki.
 

I won't waste your time telling you too much here.  What you really need to do is just go to the site and check it out.  But just to reassure you, the Wiki was developed by John Pasden, of ChinesePod.com. Follow John on Twitter @Sinosplice
 

It is well organized, well linked, and it is extensive.  The grammar explanations are thorough and written in a clear, hip kind of style which makes reading them all the more fun.  Here is a quick review by Chinese Hacks as well.
 

The site claims that this is not intended to replace a good old fashioned grammar book, which may be true.  But as a free resource that will continually be updated by experts, it's really hard to beat.  Check it out:

AllSet Learning, Chinese Grammar Wiki

Member Thomas Doherty also posted this review at almost the same time:

Wealth of Information at the Chinese Grammar Wiki Site

While on the Lost Laowai blog site  I found this link to the Chinese Grammar Wiki site.  I do not know if this was posted before or not here on Study More Chinese.