*** Gingerbread only ***
Stock dpi is 320.
The downsides are:
- TouchWiz apps including launcher, dialer, etc are not totally compatible with other DPIs. They still work but the layout will be incorrect. I didn't really find this an issue since i use market apps (e.g. GoLauncher) for most of those things. All the google apps, gmail, play, etc are fine.
- Some apps on the market won't be available depending on the DPI you have chosen. 240dpi is a good alternative since pretty much everything is compatible at this. If there is an app you want that should be available you can always set the DPI back to default, download the app and then change back to your preferred DPI.
The upsides:
- Go to pretty much any menu and tell me it's not better being able to see soooo much more.
- Similarly things like tabs in the browser take up less space, the notification bar takes up less space, etc etc.
I really can't go back to 320 now!
Try the link in here for a DPI changer that's temporary (reboot to return to normal so it's pretty much risk free, no reason not to try!).
http://forums.overclockers.co.uk/showpost.php?p=21868411&postcount=1383
For a permanent DPI change (i.e. it stays after rebooting, you can always revert manually) try this:
http://forums.overclockers.co.uk/showpost.php?p=21869526&postcount=1386
EDIT1: screenies of the difference here:
http://forums.overclockers.co.uk/showpost.php?p=20824799&postcount=675
EDIT2: I think there are modified samsung apps that look correct at 240DPI on XDA