Besides stackoverflow, what are the best sites to showcase my development skills?
For those sites that are specific to a particular set of skills, I am a ASP.Net developer and I use c# primarily.
Edit:
Something to send potential employers, and something that they would find easily during a Google search of me.
A web page, of course. get a github account. Pick up silverlight and make a cool game perhaps?
If you have a blog, that would be an awesome resource for your future employers to know more about you and your work.
Also, if you're looking for a job, there are many cool sites where you can show not only your coding skills (TopCoder, GitHub) but also what you think (Twitter), and maybe what your teammates think about you (LinkedIn).
Again, with a blog you could keep all this links together in one place.
Perhaps you may publish some of your projects in www.codeproject.com. If you have chosen a right project I think it can show your talent
Next time you take on a project that you don't mind being public, document your way through the project on a blog. It would give employers a chance to see your work patterns.
Also, win a couple TopCoder competitions. That might help
http://www.planetsourcecode.com used to be great but when I looked at it just now it seems like it has gone to the dogs. http://www.codeproject.com is pretty poorly organised (in terms of site design) but if you want to draw attention to yourself it's pretty easy to find topics on there which aren't covered and could use a tutorial/example. Consider contributing to existing established open-source projects on sites like SourceForge and CodePlex rather than starting your own. One which comes to mind that I looked at recently is http://anmar.eu.org/projects/sharpwebmail/ - it's a great project but sorely in need of a visual overhaul, which means more than just some updated JPEGs. Oxite was falling behind its roadmap targets from memory if you want another example of a good project to contribute to.
what about publishing a good nice opensource 'product' at google code, freshmeat or sourceforge?