Views arguments from URL
I've done this for Drupal 6.

In Views 2, I've had to define where in the URL the parameter(s) would be located positionally (e.g. blah/view_name/%/%) where the % represent parameters 1 and 2 respectively; then, in my next view (which was either another display or attached view within the same view file) I defined the arguments in the argument section and then they could be referenced as %1, or %2 respectively.