Fontforge has an option to export the fonts to WOFF format.
Thanks, Fontforge worked even better than the online converter - usable WOFF, and the size is 50kb instead of 54kb :-)
[1] http://code.google.com/p/sfntly/ [2] http://code.google.com/p/sfntly/wiki/MicroTypeExpress
As I understood, sfntly is just the library, so do you use some utility of your own? Is it available somewhere?