Please change all instances on the tag [opensource]
to [open-source]
. This is an issue on SO, SU, and SF (on SF the open-source tag hasn't even been created!).
"Open source" is two words, so it should definitely be hyphenated.
UPDATE (July 15/2010):
[opensource]
(86)
[open-source]
(4)
Bonus: [opensource-software]
(2) --> [open-source]
(4)