Great with a full breakfast, as so many have mentioned.
One of the pubs I use with the car clubs does a black pudding and goat's cheese starter with a sweet chutney, which is great.
Delicious simple breakfast: in a bun with bacon and marmalade.
Nigel Slater printed Paul Heathcote's cheese and black pud hash brown recipe years ago, it's a minor faff but well worth it. In fact here it is: <!-- m --><a class="postlink" href="http://uktv.co.uk/food/recipe/aid/514871">http://uktv.co.uk/food/recipe/aid/514871</a><!-- m --> (I haven't tried the sauce, which Slater never mentioned, but the basic hash browns with an egg are awesome).