QUOTE(Piano_Princess @ Jun 15 2007, 12:09 PM)

I'm playing a couple of fairly fast songs, and I find that they sound quite rushed and I often feel like I'm not keeping in time. I also have a bit of a problem with trills.
In order to clean up messy passages, one should approach the passages in several different ways:
1) Practise slowly and increase the tempo only gradually, with the help of a metronome.
2) Practise with dotted rhythm, first with long-short-long-short rhythm, then with short-long-short-long rhythm (which is harder to do).
3) Consider several notes as a unit.
4) The reverse of #3: Consider quaver or even semiquaver subdivisions. When students rush through a passage, it is usually because they haven't acquired good control over the fingers and haven't been able to feel a consistent pulse. Thinking in subdivision will help to solve the problems.
As for trills, one should practise them as measured trills at first. Again, think in subdivision may help.