Following the trend, some little things I like:

1) Things which fit together really neatly, particularly when packing / tidying and when the items involved have no particular reason to fit at all. Also true in numbers, for example shopping when it all adds up to a nice number.

2) Films with a childish imagination; 'Finding Neverland' and 'Tideland' are fine examples (though no-one I've shown it too has liked 'Tideland' yet).

3) Waking up feeling refreshed. Hard to make happen, but lovely when it does.

4) Playing a game / sport where you know you and your opponent have both played really well (and know it), and the game / match was extremely close. This is especially nice when you win : - )

5) The smell in the air after rain, which I'm told is ozone.

6) Really good cryptic crossword clues (which you get)

7) Computer games which can be 'perfected', i.e. you can spend as much time as you want going everywhere, collecting everything, etc