From my usage it is not so much as opening the keyboard and typing it and then closing it because that task is very easy and happens sub conciously. But the problem comes when your other hand is occupied and you need to just type a quick word... it is a pain in the ***. But i think a portrait osk will be almost immediately available at least for the browser. I am basing this assumption from one of the renders made by one of the canola members a while ago which looked similar to the OSK on the iphone. Since it is open source one needs to figure out how to include that in the browser which i am sure can be done easily?