From Tome & Blood's article 'Fun with Prestidigitation':
Change - Transform an object of Fine size into another one.
e.g. Change a piece of paper into a rose.
Chill - Reduce an object's temperature by 40F (but not below freezing)
Clean - Self-explanatory
Color - Self-explanatory
Dampen - Self-explanatory
Dirty - Self-explanatory
Dry - Self-explanatory
Firefinger - Ignite combustile materials, can light a torch as a standard action (rather than a full-round), light campfires etc.
Flavor - Self-explanatory
Gather - Pick up e.g. coins from a selected area
Polish - Self-explanatory
Sketch - Self-explanatory. Very useful when trying to make artistic impressions of people when you have no ranks in Craft (painting)!
Stitch - Self-explanatory
Tie - Self-explanatory. Counts as taking 10 on Use Rope, but far quicker and can be done at distance.
Warm - Increase temperature of object by 40F, but not above 140F.
Presumably the reverse of these are also possible (e.g. Untie).
They are remarkably handy at low-levels. I remember once we had to infiltrate a bar which we thought was a front for a thieves' guild, so the party wizard got a job 'flavouring' the food (using Prestidigitation) for the customers. It enabled him to talk to the owners, and get plenty of gossip. Handy spell, if used intelligently.