Why, it's a link to Grammar Girl*, the new little site I put together to let everybody know that I'm available to hire for any writing or editing needs you may have.
This may not be the optimal place to advertise such services, since I seem to have attracted a following of grammar geeks who wouldn't need such assistance, but one never knows. Surely you wouldn't all be fascinated by the comma usage section in the AP Stylebook, nor would you necessarily purchase said Stylebook purely for your own edification.
(I'm even geekier than you thought, right? It's OK, you can say it.)
(I have not checked to see what the AP Stylebook says about multiple parenthetical asides.)
Anyway, feel free to check out what's there and let me know if you require the services of a huge written word geek for any sort of project.
*I opted against using Melissa's nickname for me, The Grammar Hammer, a decision that I stand behind 100%..