Its the same from 2.1, but they fixed some issues with icons.
Themes rock now, so much better then 2.0
I give it a few more weeks and this thing is going to be even better watch
People started crying about Dock Swap not working, and what not
But I bet Summerboard will come out with options to change the docks, like dockswap had (thats my opinion). You can already make your own Themese if you know how.
Summerboard is a App that allows you to customize your home screen.
Plus more. Like Scrolling Icons on your homepage. (which helps for when you have more then the Springboard came with).
Make your Wallpaper your backgaround.
Wallpaper Alpha (darken/lighten the background)
Dock (Change the dock size)
Themes (changes background, Dock, and icons)
Plus some other stuff.
I have summerboard though Install App.
Here are some quick tips.
Connect iPhone to computer
Turn off iTunes, and iTunehelpe (any thing i tune related in processes)
Go here http://iPhone.nullriver.com/beta/
Download file to your desktop.
Open the file, and begin the download.
It will automatically Put the installer program on your iPhone.
Your phone will appear to be restoring (its not)
Then when it turns back on, notice the new icon.
Then you can go in to Installer. And all these cool ass Apps.
Also download "Community Sources" To get more apps.
I have already JailBreaked my phone, so i honestly don't know if you have to do that or not. I am sure that the website might explain.