Android/Symbian: Firefox 4 is the big browser release of the day, but it's not the only one. Opera released a new version of their mobile browser for Android and Symbian devices. New features include:

"Why," you're probably asking, "would I want another browser on my iPhone, when mobile Safari's the best one around?" Because Opera Mini on the iPhone makes pokey EDGE feel like 3G. Check it out.

The latest beta version of Opera Mini for Androids is now out as of today, with a new interface and multi-tabs support thrown in. It's not entirely dissimilar to Opera Mobile 10 on Symbian and WinMo, though.

With the impending arrival of the fantastic Opera Mobile, the Android browser wars have officially kicked off. But wait, Opera on Android? That sounds sort of familiar! Here's what's actually going on, and why this is great news:

Love that Skyfire can play any Flash videos, and optimize websites to load incredibly fast, but hate that it kind of looks like ass in the process? So does Skyfire! Which is why they've released version 1.5 for Windows Mobile.

"But Opera's already on Android," you protest. That's Opera Mini, the Opera browser that serves up pages pre-crunched for crappy phones by Opera's servers. Opera Mobile is their full-fledged, feature-packed browser that promises Flash and Google Gears support.

Skyfire, the server-compressed mobile browser that promises "the full web," i.e. Flash support, on Windows Mobile and Symbian phones, has graduated from its excruciatingly long testing period. In a word, it's great.

Symbian is the planet's most popular smartphone OS—everywhere except the US, that is. It's also arguably the most boring. In this last, most urgent installment of the cellphone revitalization series, we alleviate your Symbian shame.

Despite being the obvious choice for WinMo browsing, Opera Mobile 9.5 is far from perfect. That said, the next release, due in a few months, might even put the likes of Mobile Safari to shame.