They've made some *great* additions and it now supports nearly every console which ever had a backup unit created for (GBC/GBA/SNES/MD/N64/NES/NG/NGP/etc ... and... d'oh, my grammar really sucks...). I haven't tested everything yet, but some additions really sound great, like permanently applying GameGenie patches to a ROM Image or the new "send to SWC" option (hope they'll support other units soon, too).
Get it at http://ucon64.sourceforge.net/.
-- Matthias (who was so desperate to try this util that he even messed around with some Linux bootdisks a while ago...)