I was recently asked to add a simple twitter feed to a Drupal 5 site I built a few years ago. You know the sort of thing - a block in the sidebar with the 5 most recent tweets from the organisation's twitter account. Unfortunately, this turned out to be one of those requests that sounds like it's going to be really easy, but is not (especially on Drupal 5). I came up with a solution which does the job quite nicely, but it's a bit of a hack; I wouldn't do it like this on a new site - but then of course I wouldn't be using Drupal 5.