I got a new 24' LED monitor and wanted to ask, if there is a way playing Penumbra in a resolution like 1920x1080, because the 1280x960 isn't that good for it.

Yes, you can manually edit the settings.cfg file found in My Documents/Penumbra/, search for the line <Screen and then you can edit in new height and width values there.
1920x1080 resolution works wonders with Penumbra!
