Download Chrome

If you're on a Windows machine, skip Internet Explorer in favor of Google's new browser Chrome.  It's positively boring, it works so well.  And if you download research papers, you can pull a multi-hundred page PDF in a new tab without seeing any affect at all on the rest of what you're doing(!).

Of course, there's no FoxMarks for it yet, which is my "killer app", so my usage will necessarily be limited, but I highly recommend it.