It would be cool if there was a "history" link or dropdown of the last X tasks you viewed so you can quickly get back to them if needed.
We have a similar mechanism in place for Documents where you can click on "recent documents" and it will show all documents for the last 10 days. I tend to bounce around task filters quite a bit, but I think it would be awesome if I could quickly see...say for example, "the last 10 tasks that I viewed".