Valladolid links.

• Just about everything about Valladolid - a beautifully-designed and colourful site, a real pleasure to look at, in Spanish, French, English and German.
• For an amazing resource for online reference, take a look at Valladolid Public Library's Biblioteca Virtual.
• If you're into solving programming problems (I'm not), like The Cat in the Hat or Ugly Numbers, check out Valladolid University's Problem Set Archive.
• According to Wikipedia, Vallisoletanos are reputed to speak the purest Castilian of all of Spain - but it's a myth (they say).