List of Twitter apps that support Tweet syncing?

[JNGold]

I am looking to compile a list of Twitter apps on iOS (and Mac) that support Syncing of read items across devices.

So far, I have only been able to identify 2 that do this:

1.Echofon
2. Tweetings

Since I read tweets on 3 different devices, I am finding this type of feature to be really valuable.

I found Tweetings to be a little strange in its timeline behavior. EchoFon is cleaner and more enjoyable to use, but is lacking features (i.e. TwitLonger) support.

Can anyone recommend others?

TIA!