I've found a few lists of sites for finding niche ideas, I filtered out some of them and compiled the result here, so that I can easily find them again, it's better than a bookmark :-)

Google Insights for Search http://google.com/insights/search/
Google Trends http://www.google.com/trends/hottrends
WordTracker GTrends http://freekeywords.wordtracker.com/gtrends/
Google News - Most Popular http://news.google.com/news?ned=us&topic=po

SEOmoz - Popular Searches http://www.seomoz.org/popular-searches

Yahoo! Buzz Index http://buzz.yahoo.com
Lycos 50 http://50.lycos.com

I used to have google.com as my Firefox's startpage, I enjoyed it, but now I've put www.netvibes.com so I can list many RSS feeds and if I want to use Google I press CTRL+K on Firefox and I can type my search. I'm fed up of Google putting my sites in supplemental results, then putting me in the full index again, then not.. sadistic google! I got my revenge.. GOOGLE, YOU'RE NOT THE ONLY ONE WHO CAN BAN!!!

When I read forums, sometimes I see people asking for advice on which CMS would be adapted for their particular project, and often there are replies of what looks like Joomla fanatics who answer without any argument that Joomla is the best CMS.

I can't stand it because I know it's wrong, but then I'm not paid to promote any particular CMS nor am I paid by the original poster to convince him to choose the best solution for his project. Because let's be real here, for most common uses, from people who have no experience of CMS, Joomla will do the job as well as a number of other CMS solutions!