HOW TO: Modify Widget Backgrounds/Images to your Liking – Android Forums.

Backup Master – Android Market.

Titanium Backup

[ROM+Guide]Official i9100 Firmwares KG1/2/3/5/6/7, KH1/2/3/4, KI1/2/3/4/8 Download – xda-developers.

Samsung DIVE.

The Help page tells you how to set up the service. Unfortunately, T-Mobile has fucked up their version of the firmware, making it impossible to add a Samsung Account or register with this service.

See here for UK discussion

Fortunately it’s not too hard to update to the base Samsung firmware without voiding your warranty, as T-Mobile sends the phones directly to Samsung for fixing. T-Mobile Forum + links to instructions

These instructions take 10 minutes to implement

and upgrading to the leaked Gingerbread 2.3.4 also shouldn’t take too long.

These instructions are for the Samsung Galaxy S2

Organize your home screens using your computer!

KiuanSoft, Inc. :: Launch Screen Organizer for Android.

Free

Samsung Kies

Wondershare MobileGo

Android Sync Manager – Android Sync Software for HTC EVO, Nexus One, Droid, Disire HD, Hero and Other Android Phones

MyPhoneExplorer

Easy howto to sync through Google

Paid

CompanionLink

Gsyncit Syncs Outlook with Google