Its in beta just now, yes, and personally i really like it, especially the right click additions.

However it is only a beta 1 developer release so probably not very reliable (though i've used it for a month or two with no problems)

The phishing detection and popup blocker arent as good as IE7, but that should be sorted by release time.

I like it, no lag at all

Could anyone tell me how i could get a theme on this new firefox?

https://addons.mozilla.org/en-US/firefox/browse/type:2

For those who prefer IE7's layout, I suggest the following theme:
https://addons.mozilla.org/en-US/firefox/addon/4129


Now about my personal experience...

I've been using firefox3 since the beta versions, and I have to confirm I've seen it shut down randomly about 1-2 times a week; but with the session recovery, it's not a big deal.

I think the new address bar looks magical and extremely useful.

However, I'm starting to look closer at Opera (version 9.5 currently), and it's well attractive too! It also includes the new kind of address bar like in firefox 3.
I still haven't decided which one will be my primary browser, I'm using them a bit randomly for now...

Cheers Blutch

if you want to download it, you can get it from my website www.noughtfornine.webs.com its mainly a cricket website, but you can download firefox from my sponsored links section