I attach a Latin phrase or quote to the end of every post I make, one which is (usually) a direct example of the grammar discussed in the post. I’d like to share my two usual online sources for these quotes.
(I use the quotes within A&G within the post itself.
First, there’s this basic looking wikipedia page, which is useful because I can use control+F to search the entire collection for the particular word or feature I’m seeking.
http://en.wikipedia.org/wiki/List_of_Latin_phrases_(full)
The wikipedia page is a small collection, so for more obscure posts I’m generally forced to look elsewhere. A much larger collection is available at the European Dictionary. Here’s what a search for longior (they had one!) produces:
http://www.eudict.com/?word=longior&go=Search&lang=lateng
The trouble with both of these (and, it seems all) databases of Latin quotes is imprecise quotation. The quotes are often (i) prepared with a pretty sad translation and (ii) not properly sourced. For instance, here, there’s no further information about what work of Pubilius Syrus is quoted, which I consider a bare minimum before I’d be willing to throw this thing on my post.
These resources force me to further research the quote online, often within the Latin Library.
I wish I had an online source of Latin quotes not designed for the title page of high school English papers.
Latin for Addicts 
Real nice design and superb article.