Skritter obviously has a lot of great features. For example, the ability to make your studies more "active". You actually have to WRITE the character, TYPE the pinyin or "CHOOSE" the correct tone, and not just try to figure out how well you remembered something (hmm, did I remember this character or not? How well did i remember it? lol)
Another great feature is that its online, so that you can use it on any computer anywhere.
But for me, the best feature is that you can use it on your phone. No matter where you are, you can now make some good use of the time you spend riding the buss, waiting for the train or being bored at work etc. The sun is shining outside and you sit in front of the computer studying Chinese...but not with skritter. Take your phone, bring a cold soda and sit outside in the sun, get a tan while studying on the same time.
And then we have the fact that with touch screens, you can actually truly WRITE the character with a pen or your finger. It's not just more accurate than writing with the mouse, your remember it easier too!
The phone version of skritter works pretty well, but there are some things that you may wanna add in the future.
How about the ability to study offline? Even thought its 2011, we still dont have wireless internet everywhere. Wouldn't it be great if you could download a set number of word excercises. Like lets say you are going to the beach where there is no net, or maybe you are going to be on an airplane. How cool wouldn't it be if you could "prepare" the next 500 words by downloading them at home before you leave! Just a thought.
Skritter rules!