[MeinDCIC]

I have a MAC that I also installed XP on - the problem is that the volume/partition that has XP is running out of space fast -How can I increase this?

 

[VegasACF]

The only way I know of is to delete the Windows partition and start from scratch.

 

[davidanders]

There are utilities that allow partition resizing, addition and deletion without loosing data (supposedly). I would never try this without a verified good backup.
Google "osx resize partitions"
http://www.google.com/search?q=OSX+...ient=firefox-a&rls=org.mozilla:en-US:official

Adding an internal or external harddrive would be the preferred approach.
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