I love this question, because I noticed after a while that I started following a pattern myself when I logged in.
Like dinkan53, I always go to comments first. I think it is important to make sure hubber and visitor's opinions are out there for everyone to read as soon as possible. So I at least approve the comments. And sometimes I will reply right when the comment is approved. Sometimes there can be 5 comments waiting at once, so I may not get around to responding back to all of them right then and there if I am pressed for time.
The next thing I do is scroll through the homepage for the recently published hubs, questions, or hubs that received recent comments. If something catches my attention, I read it right away.
After this I check my account. I look to see how much I earned the previous day and reflect on the trend of which days see the biggest gains. Then I see which hubs have rising and falling traffic and try to determine why.
Finally, I check my profile to see if there are new followers. While I get e-mail notifications, sometimes I see the new followers before the e-mail. So, I click through and see who is new for me, then I go read a hub or two of theirs and determine whether to follow and post fan mail.
Depending on if I have time left, I will just generally hop around the site looking at forums, the Learning Center, more hubs, and so on.