Again, via the linuxhelp blog: Top 100 of the Best (Useful) OpenSource Applications. Although many of them are very well known, probably you will find a few you didn't know about.
Yet an other great post from the linuxhelp blog about understanding the linux filesystem hierarchy.
Via the Grand Stream Dreams (GSD) blog - changes in Blogger. I know I'm a little late in the game, however it seems that the blogger platforms starts to become more mature. Originally I choose blogger over something like Wordpress because of its simplicity, but there were a few features which I would have liked to be included. They start to appear, although the post editor is still pretty weak. One thing I would have been interested in is the embedded comment form, but for some reason it doesn't seem to show up in my options. Starting from this blog post I also discovered a very nice site for all of the users of Blogger. A particularly useful link is a page to tell Blogger what featues you would like.
From the Bad CTK blog - how to make your PHP software run faster. Interestingly, just a few days ago a colleague was saying that he didn't like PHP frameworks because they overcomplicate things.