File Uploads: What security-issues I have to take care of?

Hey,

in my first "real" and own project, I want to implement the ability to
upload files to a user's account. The filetypes I need to be able to
upload are:

- PDF
- JPG
- GIF
- PNG
- XLS
- DOC
- OpenOffice Documents
- ZIP
- RAR

Before I start to implement a file-uploading action, I need to
consider what are the security-risks of fileuploads in general, and in
case of any of the listed filetypes above.

What are the dangers of these filetypes, abd how can I prevent myself
and my server from getting in danger?

Regards,

DD
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