mostly landscape here for the same reasons, games, vids, photos, web, news, etc. portrait to read books and comics (I'm a big kid and need my walking dead fix in bed, wife hates it!) lol
i guess im one of those portrait guys
which isnt that good on the playbook as many native apps are landscape only but the 2.1 beta supports me in my decision and i have to admit that i use a lot of android apps.
sure for games and videos i will turn my device arround to get the most out of it but for apps i prefer portrait. i can type much faster and better too.