You got many options here lopie...
1. Save the project as .bun, and burn to CD.
2. Save the project using "folder per project", burn both project file and wave data folder into CD. This way, if the wav data is bigger than CD capacity, you can divide the data into two or more CDs. In your partner's comp, put the whole wav data back into same folder.
3. Next door, eh? LAN !!!
4. If both PC has internet connection, then upload the project into temporary server on the net (may need to sign up on public server), for your partner to download.
5. I bet moskus will say... get DVD burner!
6. It's not preferable, but doable. Use removable HD on both PC. Last time I checked, the casing slot is as cheap as $5.
7. Get the whole PC to your neighbour.
8. Tell your partner not to be lazy. Get his ass to your studio, do his part on your machine on Friday evening. You two love red wine, don't you?

Jaymz