The last of the Firefox 3 betas has hit the scene, and at this point it is hard to believe they are still finding things to improve on.  So where are the improvements from Beta 4 to Beta 5 of Firefox 3?  Well this is what Mozilla says:
Firefox 3 Beta 5 includes more than 750 changes from the previous beta, improving stability and web compatibility, providing platform and user interface enhancements, and resulting in the fastest Firefox ever. Many [...]

So should you or should you not be using Firefox 3 yet?  I would say for 90% of the population or people using Firefox, no.  You should at least wait for the release candidate versions or the final version.  The fact of the mater is, even though Firefox 3 looks good it still is not done yet.  The idea of bringing this topic up started after reading a post over at Cybernet News:
There is a lot of talking going [...]