Default space problem with Omnia.

Hi.
I have a diskspace problem with omnia. The memory thats 73.66mb total runs out of space quite fast? Why is that? My windows catalog is 233mb big, is that normal big?

I think it's temp files that fills the space I have deleted all temporary internet files from both Opera and IE. Someone have an idé why i run out of space?

Sometimes I get a message that says. You have to delete files to be able to recive any new sms. quite annoying.

Thanks for any help.
Christian