I know that TextMate isn't an open source project, but maybe the original icon designer could release a higher resolution version of the logo, and in the interest of evolution, let us graphic designers play around with it?
I too like the concept of the logo, but the execution is a bit lacking for all the reasons mentioned previously. When I look at my dock, I want TM to stand out as much as Thunderbird and Firefox. Having some source artwork to work with would give us a chance to help out in that effort.
Chris