MarvinH - 1:33 pm on Sep 9, 2011 (gmt 0)
Sorry for my delay in replying.
I ended up implementing it. Now my CSS is a part of the base html file.
This is just my hobby site, so I don't mind taking risks and experimenting. It is a vBulletin-based forum, but it has been modified quite a bit for speed. For not-logged-in users, the home page now only has 3 http requests, individual forum sections have now only 2 http requests, and threads also only 2 http requests (excluding user-posted images, if any, and Adsense, if any).
Having so few http requests, I thought one request saved was a big deal percentage-wise, so I ended up doing it.