[edit]
For Banshee 0.10.x
Please note - these WILL NOT work with Banshee from CVS HEAD! 0.10.x only (or CVS stable branch, if you're using it).
Some of the official plugins, from svn revision 170, taken on 20060626:
banshee-official-plugins-r170-0.10.x.tar.bz2
[edit]
For Banshee CVS HEAD (upcoming 0.11.x)
Maybe someday...if you ask me nicely on IRC I'll post 'em for ya ;)