A user just asked me to write a little bit about what to DO w/ Domains you've bought - since you don't want to have them up on some shelf gathering dust, here's a few quick ideas:
1. Park them at Sedo and list them for sale (appears to be a bit lame, but at least it produces statistics that can help you decide which to develop and which are probably stinkers).
2. Point them to your existing sites in order to gain type in traffic
3. Find cheap hosting someplace like Webintellects.com and develop a site - even if it's just a skeleton, it can begin developing some pagerank in Google
4. Get cheap hosting and put a BLOG up in the space
5. Create your own "parked page" at your host - GoDaddy allows you a free page you can semi customize - you can put anything from a business card to an ad for something
I'll have to expand more on this later - just wanted to give a quick response. I'm still dealing w/ quite the backlog of work left over from the holidays - but I've got lots of ideas for articles, and hopefully I'll have more time in the next few weeks.
Do you have any other great ideas that aren't listed above, if so leave a comment with any suggestions.