I would think a succesful PDA version would require more specific offline syncronization and not just a limited bandwidth version for online browsing.
There are many more people who would use a conduit approach (or an AvantoGO approach) that allowed them to sync to interesting threads, pull down headers, write replies offline and re-sync etc., than would be browsing online in real time.
Both interfaces would be nice, but I suspect the sync and go interface would get much more play.
-t
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