Recently, in July 2006, the Dutch celebrated the 400th anniversary of the birth of Rembrandt. After leaving Amsterdam behind I learned that Rembrandt was born in Leiden and spent the first 25 years of his life here.
Although most major celebrations and exhibitions took place in 2006, here's a comprehensive list of Rembrandt-related places to see and things to do in Leiden, Amsterdam and beyond. The photo below shows a nice place to start, in Leiden anyway: It is a sculpture made in his honor to celebrate the 400th anniversary. It stands near the place where he was born, aptly named Rembrandtplein.

