I looked up the 'Best Thing Since Society' website, and they have spent years campaigning for something to replace sliced bread in the 'best thing since' category. Here are some of the alternatives they offer:
resealable coffee packets, the suck nipple on bottled water, cashback, the 'recall email' facility on Microsoft Outlook, Snake II, multi region DVD players, Orange Wednesdays and the Daily Telegraph Giant Geberal Knowledge Crossword.