One of the most relevant descriptions I've read about what collaboration is and isn't comes from Michael Sampson, specialist in team productivity and collaboration. His 7 Pillars of IT-Enabled Team Productivity: What Teams Need from IT Systems to Be Productive is well worth reading. You can download it for free (requires registration). It will give you an exciting, challenging view of what people really need when they work together in virtual teams. You'll find yourself thinking "If only I had that in my company!"
The 7 pillars: