Looking around for good Linux applications or perhaps some tutorials? You'll find many applications in our database here at OStatic (just click on Software and enter your request in our Search field), and I've also been looking into some useful new resources. Tuxsoftware is an interesting new pit-stop. On its home page today, you'll find featured applications such as Flyback (similar to Apple's Time Machine backup utility), and Pidgin (instant messaging). You can also search for applications, although I don't see any citation of how many there are in the site's database.
Tuxsoftware sorts the applications it houses by category. Categories include Graphics, Internet, Multimedia, Office, System, Accessories, and more. Users can also submit applications to the site's database.
Linux App Finder is a well-known database of Linux applications and information about them. The site offers multiple ways to search, and it has a blog, although the blog isn't updated very regularly.
Through a citation in Linux App Finder's blog, I did find out about Open CourseWare for Linux from College@Home. This is a good find. The site offers free online courses on many Linux-related topics. You can take concise courses on using Ubuntu, GnuCash (finance software for Linux), FreeMind (mind mapping software), Gentoo Linux, GIMP, and more.
When it comes to educational Linux sites, though, my favorite remains Unix-Tutorials.com. Check out the long list of Linux topics you can dig into down the left rail of the home page, with content aggregated from around the web. These include nearly every popular Linux distro, in addition to other Unix-based titles such as Solaris.