Changing the size of the OSX partition? possible?

Yes there is! There's a tool called Winclone that makes this process much simpler. Here's how you go about it:

1. Boot into Mac OS X, if you're in Windows
2. Download/Install Winclone
3. Run Winclone, it'll ask to download the NTFS tools, so go do that
4. Install the NTFS tools
5. Run Winclone again, this time clone your Windows partition to an image file
6. Quit Winclone, run the Boot Camp Assistant
7. Delete the Windows partition
8. Create a new, larger Windows partition
9. Quit Boot Camp Assistant, launch Winclone again.
10. Restore the clone you made earlier
11. Go to Tools -> Expand NTFS filesystem to make Windows able to use the new space
12. Boot into Windows.
13. Windows will check your disk for errors, then boot normally.

 

You need to clone your Windows partition, remove it via Boot Camp, and reinitialize it.

See http://twocanoes.com/winclone/

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Edit: Like he said ...