brian.sniffen:
Sure, I'm happy to convert the PSDs (available in the src/ directory, here [1]) into SVG, but I will have to do so through tracing them in InkScape unless somebody has another solution.
Many of those are on one basic template. I have no expertise to advice on the choice of greys, but I do like MetaPost. I have created a basic metapost encoding of your logo7, and placed it at <http://evenmere.org/~bts/haskell-logo/>.
I'm not entirely thrilled with its use of explicit constants to end the equal sign or place the groin of the lambda, but this'll do for a first draft. A PDF generated from that MetaPost file is there as logo-0.pdf for easy evaluation. I experimented with the PDF-to-SVG converter at <http://www.tlhiv.org/MetaPost/tools/mptosvg/>, but do not expect anyone to be thrilled with the results who must edit them.
I also experimented with potrace. The results will are wiggly. They may be inspected at .../potrace/.
Here's a traced bezier curve (inkscape) of the potrace result: http://galois.com/~dons/images/logos/logo-bezier.svg And now it is easy to play with: http://galois.com/~dons/images/logos/logo-pastel.svg Next step would be actually turn out some badges/logo/icon images to be used on haskell.org ...