I downloaded a pack for a Nokia E65. I assume it uses the same Symbian OS at the 6110. Some applications need to be 'signed' in order to get them to work. Quite a tedious process, but you'll find out more from Google I'm sure.
The pack ends in "S60v3.SymbianOS9.1", give it a google...
Check out the ported Quake I game. Uses the actual PC files! There are alot of Symbian sites in the web that review S60 software and some are freeware/demos