Hundreds of PDF flat floor plans, plus several hundred JPG site plans and PDF block plans. Every SBF launch I waste about 10-20 hours to download from HDB website. You can download all them in 10 minutes for 2-3 cents per file!
Note: if you want to collect individual HDB flat floor plans with dimensions, buy the March 2012 collection, which contains lots of repurchased flats. Newer SBF (2013 onward) contains mostly unsold flats from BTO project thus most files are block floor plans without dimensions.