Recently I responded to a question on how to make a Views Filter respond to a Cookie value. Put another way — if I have a View and I want to save off a filter value; how can I populate the filter criteria without having to submit the $exposed_form first. How can Views remember the value from a returning visitor?
The nice thing about this task is that Views provides a mechanism for you to do this from the Views Administration UI. This is true for essentially Drupal 6/7 and Views 2 or 3 at the time of this writing.