I am with Tim... Aperature is probably the single most important factor of photography. To add to that, yes the camera is capable of taking nice pictures in auto mode, however 2 factors to keep in mind.
1. Taking a photo on auto can be done by anyone, takes all the fun out of it.
2. The photo's that you can take by going to fully manual is very noticable.
Next small suggestion. Set the 500d to take photos in RAW not JPG, whilst the file sizes are much bigger (up to 20mb on my 50d). Then use the software that comes with the Canon camera (Digital Photo Professional) very easy to manipulate photos using that software if it is in RAW mode.
probably a bit late for this advice.
However, I am sure you will want to get additional lens's one day, or it may help someone else... the lens's you buy are more important then anything else to do with the camera. The lower the f stop rating the better the lens.
Canon have different ranges of lens's. The middle range (has a gold ring around the end) are great value for money. They focus in about 1/3 the time a normal lens will, plus f stop is excellent for letting more light in.
For example, my favourite lens I have is a 85mm f1.8 lens. Some of the pics I have taken with this lens have been loaded onto two fb albulms...
http://www.facebook.com/album.php?aid=1 ... d273089dcband
http://www.facebook.com/album.php?aid=1 ... 215406f5ac