tangor - 6:46 am on Apr 22, 2010 (gmt 0)
If that link can be found off site (a link to your page via another site) you will be indexed. Nature of the beast.
Meanwhile, visit the Apache forums or use the new advanced search at WW for robots.txt for other pointers.
Do realize that your robots.txt is also a blueprint for robots (or scrapers) to find content on your site... the baddies will ignore instructions and go straight for the goodies.