Move App and data to external SD card - Android phone

I have a phone that only have 1.7G memory. A few apps will fill the memory and make the phone run very slow. There are two Apps that can help with the situation, but you need to root the phone (have root access).
The first one is link2sd. This app will move you data to the external SD card (you need to create a partition of ext2 or ext3) and then make a link to the internal memory. That will save you a lot of internal memory.
The second app is called gl2sd. It is designed for games with a lot of data. This app requires root as well. It will move you game data to external memory and then you run your game from within gl2sd. If you run your game from outside (launch app directly) you will not see your data anymore. Restore takes a bit effect, too. You need to manually copy them back to your internal memory. Or you can make a backup before move the data.