Fellow Ubuntu users,
in the last four weeks, I've created an open-source tips, tricks and howto site that works like a social bookmarking/social networking site. You can submit your tricks/tips/howtos directly or link to your website/blog/forum post or whatever. Of course the tricks are taggable, so it is easy to find what you are looking for. There is a nice little feature: if you paste an error message, it tries to find a matching trick/solution. After a while, it should have enough solutions in the database that it shouldn't be necessary to use Google. Here is one example: http://howflow.com/pastes/52.
The site is non-profit/non-commercial (do not submit commercial stuff) and is looking for beta testers. If you want to try it out, just send an email to flow 'at' howflow.com. Here is the link to the site: http://howflow.com/.
Hope to see you!