A good way to kill some time this Friday (assuming you're not going to the St. Patricks Day parade) might be LISWiki.com. Have a look at What's Been Added, or maybe start with The Index, add onto a Stub, or browse the LISWiki Categories.
The LISWiki:Community Portal has some good Article Ideas: Stumped on what to write about? See if you can fill out the Categories some more, develop the shorter entries (some are blank) and stubs, or help fill the needed entries (titles linked to twice or more), or just browse the Recent Changes or help finish up the categorization scheme, it could use some ontological overhaul.
Entries and categories targeted for enhancements include:
LISWiki is a free and open publishing system. Everyone is encouraged to share information in your areas of interest or expertise. Anyone can edit existing articles or create new ones. New articles are welcome! If it doesn't already exist, a "create an article with this title" link will appear in a search for your article title.