Check this post to see 101 ways to make money using opensource. Check the first 10 ways, if it interests you read the full post.

1. Sell the Reference Manual ( JBoss)
2. Sell a subscription of the documentation (CDN)
3. Sell the Installer (Out of the Box)
4. Sell Custom Software Development (CDN)
5. Sell Pre-Integrated Applications (JCorporate, RedHat ACS)
6. Sell "Enterprise" version. (WSAD, Sun Studio)
7. Sell Extensions (Instantiations, Embarcadero, SlickEdit )
8. Sell a Consumer Device (Tivo)
9. Sell Proprietary Software by improving Open Source Software (Poseidon)
10. Sell Code Management Services (Sourceforge, Sourcecast)