http://dl.dropbox.com/u/48235/BITCOINSYMBOLADJUSTMENTPROPOSAL.pdf

Downloads:
EPS: http://dl.dropbox.com/u/48235/BITCOINSYMBOLVECTORS.eps
SVG: http://dl.dropbox.com/u/48235/BITCOINSYMBOLVECTORS.svg
PNG: http://dl.dropbox.com/u/48235/BITCOINSYMBOLPNGS.png
If you don't want to read the PDF, here's the tl;dr:
Problems with the currently used bitcoin symbols include: One is the Thai baht and the other is a B with two extra vertical slashes (for a total of 3) which can look cramped if written manually and interpreted in other typefaces. It also takes time to write.
Problems with designing any new symbol: Can't look remarkably different to the ones being used now.
My proposed solution: Combine the # sign with a B to give the symbol meaning and simplicity.