Thansk for giving a hint. But unfortenately I think currently there is way too many applications that break if you set the High DPI. For instance MS SQL Reporting Services 2008 fails. Just tried it -> some text is not being displayed any more in reports. So even MS itself did not really take care about this really important Windows feature - which is by fact in Windows since Win98 (or was it Win2000).
So i guess it will take a while until this wil be really useful.