Paul King has put together a phenomenal collection of Manhattan Brewing Co Breweriana. Alot of his collection is shown on his web site along with Manhattan history, brewery information and some really cool brewery collectables.
IBrian collects beer cans (Wisconsin Flat tops and U.S. Gallon Cans), Walter's Brewing Co items, Beer Cork crowns and beer-related punch boards and PAM and Telechron clocks with beer logos. He also has a ton of Wisconsin items for sale on his site.