New to the area: Bicycle questions

[sindrian.livejournal.com]

I'm going to be staying in Medford for several weeks, and I had a few questions about riding my bike in the area:
What local laws should I be aware of/where can I find a list of said laws?
How secure do I need to make my bike when I leave it outside? (Is locking the frame and the front wheel to something enough, or should I also lock up the seat and/or rear wheel?)
Can I take my bike on the T?

Thanks!

Comments

Thank you all!

[sindrian.livejournal.com]

Thanks to everyone who posted! I have to say I'm amazed by the amount of advice I got here; I was only expecting a handful of links. What a great community!