[whpalmer4]

If your email is primarily text, and you are willing to leave your Mac running while you are on the road, you can get a pretty good bite out of this now. Set yourself up with an account that you only configure to be read by Mail on your Mac -- you don't want to read it with your iPhone OS device, only send to it. Set up the Mail processing feature in OmniFocus to intercept messages to that mailbox from you using the "+omnifocus" address variant. Now you can read your mail on the iPhone/iPad as usual, and if you see something you want to turn into an action, forward it to that "+omnifocus" address. Mail will stuff it into OmniFocus when it next processes your email, and OmniFocus will sync a minute or so later; your next sync of the iPhone/iPad will pick up the new action(s) in your Inbox and you can edit them, assign project, context, etc. You will not have a link that will take you directly to the message in the Mail app, but you will have hot links for email addresses in the headers of the message, so you can tap one to respond to the sender, or you could use the iPhone OS copy/paste facilities if there's a more complicated set of addressees. Unfortunately, attachments don't seem to come along for the ride, and that could definitely be a deal-breaker for some.

Another option would be to use a "remote control" setup like VNC or LogMeIn to connect back to your home/office Mac to invoke the clipping service on any needed messages.