I don't use Twitter, but I know a bunch of people that do...so here's my take on a Tango-styled Twitter icon.
Any criticism is welcome...I would love ideas on how to improve this (or any of my icons, really), so please give me feedback.
48x48, 32x32, 24x24, 16x16 PNGs included, SVG and a combined .ico file.
By request, this icon is now public domain. Enjoy!