paste.lisp.org contains not only lisp code, but also code from other languages.
Its main goal is to provide a way to share code in IRC. Also, I found it difficult
to search its lisp code.
Another similar project is cl-cookbook, but it lacks of user interaction.
As for lispsnippets.org, first, I want to have a site that focuses on common lisp. Secondly, I am a lisp newbie, I would like
to have a site to save some pieces of code while I am learning lisp, so I can check it out later on.
Some other ideas include every user can have its own favorite snippets, download your snippets, and
send lisp code in emacs directly to lispsnippets.org. Although these feature doesn't appear in current
site, I will keep working on it.
However, what features should include in this site is totally depending on its users. If you find this site is userful,
welcome to contribute and make any suggestion.