I downloaded an application then decided not to load it..I cancelled the installation. Now I want to know how to delete the installation file of that program. How do I find it and delete it so it doesn't use up space?
AFAIK cancelling the installation will remove the downloaded file.
If you have a file explorer you can also check in /system/app to see if the file is there, but not 100% sure where it goes (if its still there) once it downloads from the Market.