[whpalmer4]

Doesn't look feasible at the moment, as the Applescript dictionary for Sparrow Lite only shows support for creating an outgoing message. Also doesn't look like there's any support for getting a link to a message. You can clip selected text from a message in the usual way, but not the entire message + link like you get with the Clip-o-Tron.

Perhaps you could convince the developers that the ability to support an OmniFocus clipping plug-in would be a big selling point...I suspect Omni would be willing to tell them what they needed to provide, if asked.