So you just bought a brand new android phone. Pretty cool isn't it, especially compared to all that apple iphone/ipad/ipod crap. You can get a shit ton of apps for all kind of possible tasks. But what if i told you that you can get much more out of your phone?
There is something called "Custom ROMS" out there on the internetz, which is actually just a modified OS (operating system, like Windows 7 for computers) of the original android. These ROMs will run MUCH faster on your phone because there is no bloatware/adware from the manufacturer. I have a Samsung Galaxy S with Darkys ROM v10.1 and i will never go back to anything original.
Here is a guide on how to flash your phone. It's a very well explained guide and the whole process is very straight-forward.
Then of course you can get various themes and other eyecandy...
Here is a little list of custom ROMs you can get: