Below is a cool 3d text generator that gives you the ability to create a decent header in 5 minutes:

This demo is somewht limited, you can only have a white background, etc.

Also, mess with the font size to get your text the right width.
Then (optional):
-Copy the graphic
-Open GIMP, setting the project to be 770 pixels wide by 130 in height
-Paste the graphic into GIMP
-Add subtext and/or other mods
-Crop unneeded space
-Save the file

This is a fast, easy and fun way to generate a decent header for a number of your sites, especially blogs.