I have downloaded Steel Browser and Dolphin Browser. Currently trying them both out and both have their pros and cons.
The Dolphin Browser is I believe based off of firefox but I don t think they have it right yet. Zooming from what I can tell is only done by the zoom bar you see on the standard browser, no double tapping unless I missed a setting. Dolphin does have tabs and is skinable. It has the option to set how you want the pages emulated, android, desktop, or iphone.
The Steel Browser doesn't have tabs but can have multiple windows. They are easily switched between by swiping left or right like you would on our home screens. Or you can hit the window icon and view/select windows that way. I like the zooming features on this browser better than the Android or Dolphin broswer. You can double tap to zoom in/out or if you gently hold your finger on the screen, zoom controls appear around your finger, very cool and extremely easy. This browser also has the emulation choices like the Dolphin browser. The stock android browser lacks this option.
I think everyone should download the two browsers and decide for them selves. Right now my choice is the Steel Browser and that's just after 10 minutes of use. The lacking zooming function on the Dolphin browser has me turned off. I hope there is something I'm missing on that browser in regards to the zoom. The Steel Browser will replace the stock browser for now.