Or alternatively, you can change the font size setting in your browser - might be easier, and it doesnt affect the size of other things.
Eg, in Firefox: click the "View" menu at the top of your browser, click "Text Size", then click "Increase". Or just push the Ctrl and the + button at the same time, that should do it too.
Hmm - I just checked it, Internet Explorer (I'm using v7) has that option too: click the "Page" button at the top right of your screen, choose "Text size" in the drop down menu, and choose "Larger" or "Largest". Except -- it works like a charm on, say, the Google News page, but it doesnt seem to work on A2K. I'll post it on the A2K bugs thread..