I tried Squarehome2... it is definitely one of the better WP style launchers out there.
Arrow from Microsoft is pretty good too... love some of the unique things it does with recent photos, calls, etc...
Yeah... I just love the WP style... I really miss my 1520... pulled it out the other day to swoon over it...
I'm actually writing one myself... looks and works a lot like WP and uses notification data for live tiles... it's in Alpha testing right now... but it is making it a little easier to deal with the move to Android. It's called RevoLauncher.
You can join the alpha... not quite sure how to link to it but there is a post in the beta forum (should be able to just search for Revo Launcher and track it down that way) with a link to the site to sign up for the ALPHA.