Mutual Funds, Roth IRA, Savings Bonds, TSP, and Annuities... What

Thank you all those who had any suggestions.

I am looking for a way to maximize my savings for the future.

Here is what I am dealing with:
1. currently 24 years old
2. $90K income (health professional)
3. Not a big spender... saves majority of earnings and still live
modestly.
4. have Roth IRA, Savings Bonds, TSP account
  - started roth in 2006 and maxed out for 2006 through 2008
  - have several savings bonds and plan on holding them till maturity
  - on my way to maximizing TSP account (like a 401K)

I was thinking about opening up an annuity because it doesn't have a
contribution limit like the TSP and Roth IRA.  I would like to
contribute monthly and being so young I think it's a great time for me
to start my retirement/savings plan.

Does anyone have any suggestions on if this would be a good step for
me to go into?  Should I be going into annuities?  Are there other
options that I can look into?

Thank you to anyone that response to this message.