chrisains - 3:54 pm on Apr 6, 2011 (gmt 0)

The technical challenge (and gray area) is recognizing all the mobile user-agents properly.

Agreed! If you do go down the 301 route (which I have reconsidered since my previous comment) you certainly need to ensure you do not accidentally 301 any non-mobile crawlers to the mobile domain/sub-domain! Identifying all mobile user agents if one hell of a task so if anyone has any ideas/resources please share!

I'm gonna stick with the 302 for the time being as it seems to be functioning adequately - "if it's not broken don't fix it" as they say! I'll check back with an update in a couple of weeks.