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So, maybe I'm missing it, how can I mark all as read?
For ICS: Not necessarily the easiest way, but checkmark the ones you want to mark and then hit the open envelope button at the bottom of the gmail app.
that's what we're trying to not have to do.
we'd like to 'batch' process without singling out via checkmarking, etc ("mark all as read"...."delete all"...."move all", etc).

I figured... but didn't know if you knew about the LONG way. Maybe it'll help someone though.
I too would like the feature!!
Or just "select all" would be a help I think.