Here's a very simple patch...
I noticed that the default pager's links were missing rel attributes, which can be useful if you happened to have become addicted to some Site Navigator browser extension... With this Drupal 5.0 patch, the pager will make the browser aware of first, prev, next and last links, where that feature is available, of course...
Included with this post is a diff file for the includes/pager.inc script I generated from winMerge. I'm sorry I couldn't post a more standard compliant patch. As I'm still just getting acquainted with Drupal's internals, I haven't set up my installation under a full development environment.
I hope it helps more than it annoys...