What's the best way to take care of my chain?
Keep it clean. Duh! Seriously though, rather than rewrite in great detail what's been done much better elsewhere, I'll just summarize the highlights and let you read the full how-to in the links below. Their key points are:

• Maintain your chain every 500 miles
• Get the chain warm by riding the bike around
• Use WD-40 or chain wax to remove any old gunk. Be thorough.
• Use Maxima Chain Wax sprayed directly on the chain with a rag to backstop for overspray
• Use the rag to wipe off the excess
• Clean wheels and make sure no chain wax is on the tires or brake rotor
• Repeat in another 500 miles
• Don't use PJ1 or other "no fling" chain goo. It just attracts dirt and flings anyway

Here are the links:

Jason Tucker's chain care - thorough discussion of the procedures

Ducatisuite Chain Lubing - nice step by step pictures

Chris Kelley's Chain Maintenance - Chris advocates using chain wax for cleaning, not WD-40