And for those who are not keeping up with what's new with Android: 4.0.X is the latest version of the OS. It works on both smartphones and tablets. Currently only Samsung Galaxy Nexus runs it. Nexus models are made to run the vanilla version of Android and thus get their updates much faster. Galaxy Nexus was made for Android 4.0 and is the first smartphone to not use the hardware buttons, as they are no longer needed with 4.0.
There are still new phones coming out with 2.3.X and hardware buttons. This is because they started working on these devices a long time ago, I think I've seen one without from CES so far. But 4.0 works with hardware buttons as well. Many of the biggest companies have announced updates to 4.0 for their 2011 phones.
For those looking for a cheap tablet Asus have recently announced a 7" tablet running Tegra 3 (quad core cpu etc.) for only $249. And it will of course run 4.0.
OK, not really the best thread to post this in