I'm still a huge Opera fan and after not using it for a long while I've recently gone back to it. Version 9.5 is sweet with a nice crisp clean interface. I thought I'd miss Adblockplus and the spellchecking but with a few downloads that problem was sorted out
It's email handling is miles better than thunderbird too. Although nothing really holds a candle to outlook atm, it's just I would like something more light weight for home use than outlook when I don't need all those features at home.
I'm currently using Mozilla Firefox 3.0 RC2, Test Portable Edition (PortableApps.com), so I can keep my settings after a re-install(have it on another partition) and/or to use it on my flash drive away from home.
Although I have already pledged to download official Firefox 3.0 RTM as to help out Mozilla.