Along with the new Firefox Add-ons web site, the people at Mozilla also treated us to a new feature called collections.  What are they?  Well, they are a group of related add-ons that are assembled for easy sharing. 
Here are some of my favorites I have found thus far:

Web Developer’s Toolbox 12 add-ons to help you speed up the development process when it comes to web development and managing the ins and outs [...]

Time to have us a good old extension cage match. In one corner you have the Hawaiian punch of the link sharing world – Mahalo Share. In the other, weighing in with way too many link sharing resources is Shareaholic. Here is what each brings to the table…
Mahalo Share – Share and recommend Web pages across many different services; recommend a link once and have it automatically posted to any of Twitter, del.icio.us, MySpace, Ma.gnolia, Jaiku, your [...]