This is a little experimental web app that generates a vector image to use when establishing a typographic baseline grid.
For example, apply this style to your body element:
background: url('http://www.baselineme.com/32') center top repeat;
That will give you a baseline with a height of 32 pixels. Just change the number to match your line-height. Easy, right? Now you don't have to use Photoshop just to make a 1px wide image.
You can also visit a BaselineMe URL in your browser, right click, and "Save as..." the vector file for local use.
You can read more about BaselineMe on my blog.
Hope you find it useful.