It should really be stressed that mixing services aren't enough.  Every bitcoin that comes in and every bitcoin that goes out of your possession needs to be obfuscated for true anonymity.  To accomplish this right now you could theoretically use a mixing service to accept all your coins and a mixing service to send all your coins. 

However, you still run into the amount tracking method.  It's pretty easy to look at the public transactions and say 5.93407 BTC when in here and 5.93407 BTC went out there.

To fix this problem you could have an "anonymous" account on an exchange or an online wallet accept and send all your transactions and only release 5 BTC to yourself at a time.  Of course how safe and reliable the exchanges and online wallets are still remains to be seen. 

However, now you run into the traffic problem.  If you're the only person doing this the 5 BTC transactions stand out pretty clearly.

There is also the problem of convenience which is tied to the traffic problem.  Doing all this manually is a pain in the a$$.  What is really needed is a client that will do it all for you.