I hope you haven't forgotten: Today is Firefox 3 download day. Head on over and download Firefox 3 for your platform and be a part of history. Help set the new world record for the most downloads in one day.
As of 10am US PDT (18:00 GMT/UTC) you can grab your downloads from GetFirefox.com,
and there should be a Solaris version available too.
Update: I've just heard on the internal aliases that there won't be a Solaris/OpenSolaris build available or included in the world record stats. Apparently it's got to do with some strict restrictions by Guinness. I suspect it's probably because the Solaris/OpenSolaris builds are contributed builds, not official builds.