Cloudy Nights has a great article about the Collinder Catalog, a list of 471 open clusters compiled by Swedish astronomer Per Arne Collinder for his 1931 dissertation. There have been requests in the forum to post the catalog as a PDF, so I copied the list and notes into OpenOffice (which is free, and awesome, btw) and exported it as a PDF. I would have simply posted the PDF to the Cloudy Nights forums, but they don’t allow attachments larger than 124 Kb. So I’m putting it here instead.
Please note that this is not my work at all; Thomas Watson did all of the heavy lifting in terms of updating Collinder’s list and turning it into a useful observing too. All I’ve done is convert it into a PDF so people can use it more easily.
Update, October 20, 2010: Thomas Watson posted an updated version of the catalog which corrects some minor errors in the first version. The v2 PDF below reflects those changes. Thanks for the heads up, Thomas–and for the mountain of work! It is certainly a lovely gift to the observing community.