two things worth to look at:
a) pressing the email link is really difficult, it would be easier if the all cell could be touchable.
b) I know on the iPad you can open a "Send an email" window without leaving the app. It's probably possible on iPhone 3GS/4 as these phones support multitask. Have a look about it if it is possible to make something nicer for 3G and for 3GS/4.