Citrix has released an update to Citrix Receiver for the iPhone and iPod touch. As you can see, there is literally a boat load of enhancements and fixes in the new release.
The things that I think users will like, include the seamless handling of Citrix accounts, the new user interface, and the ability to change session resolution.
You can read more about Citrix Receiver for iPhone OS on the Citrix website. You can download Citrix Receiver 2.0 for iPhone OS from the Apple iTunes App Store. [iTunes link]