I'm also making the assumption that we're talking about silent whisper... let us know if there are other sites we should look at.
Definitely optimize your main graphic... I ran it through Fireworks and got a jpg that was 30k in size, a significant reduction.
Next, go to your webpanel and create a stats user account (if you don't have one yet). Checking your stats will allow you to see what files are being accessed most frequently, thus allowing you narrow down what you need to pare down.
How is your conuery usage?... since you're using a blogger it would stand to reason that it should be off the charts too if you're getting that much traffic.