How to make Tumblr and WordPress work together nicely?
I don’t think a tumblelog as it exists can be embedded into the WordPress sidebar, for the very reason you’re running into. That having been said, I use KB Advanced RSS Widget to display the RSS feed. Just the titles. You can see how I implemented it at the top of the sidebar here. (Since the titles run long, you might want to abbreviate their length … you can do that by having the last variable of the widget be something like
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