The font is sized with ems and should be resizable in your browser. The base font size is quite small but I just checked it in IE with text set to medium (I normally use Firebird) and it didn’t look too tiny. You can change the size of the text in Internet Explorer by going View > Text Size.

That said, is my base font size too small for people? If you think it is, let me know (and which browser and size you are using).