Alaska,
I run from a hidden and encrypted OS(check out TrueCrypt, it is free). Also, I run through a paid VPN, HideMyAss. One day my IP is in Texas, the next day it is in Colorado, you get the idea. It costs a few dollars a month but it is worth it for peace of mind. I don't worry so much about being caught through this site as much as I do LEO showing up for some random reason, then being able to track down my web activity through my pc or internet provider and build a case.
I read somewhere, if you don't want to get busted then don't grow weed. If you grow weed, then always have a contingency plan. How are you covering your tracks? How will you handle the situation if the police show up at the door? Make sure that you have as minimal supplies as necessary on location. Lastly, NEVER EVER SAY ANYTHING until you have spoken to a lawyer! Always instruct everyone in your house not to say a word. Anything can and WILL be used against you in a court of law. Even, the seemingly obvious comment, "yes those are marijuana plants". I cannot stress that last comment enough, NEVER SAY A WORD until you have spoken with a lawyer. LEO always wants to "reduce your sentence if you cooperate" because it makes their case easier and guess what? LEO doesn't set the sentencing. That is up to the courts.
Stay safe,
A4