I scanned through our site's list of games recently and realized we haven't covered any of Dr. Bennett Foddy's Flash titles -- a huge oversight. By day Foddy works at Oxford in the Bioscience department; by night he crafts neat little arcadia that aren't particularly complex or deep but definitely entertain. If you hunger for coffee break time-killers you're in luck. Fun factoid: Bennett named all of the rooms in Terry Cavanagh's V^6.
Too Many Ninjas! casts you as a renegade samurai, protecting a plot of land from the eponymous ninjas. Use the arrow keys to swing your sword. Naturally, you score double points for swiping a ninja star out of the air and impaling it into a foe's skull.
I don't exactly know the rules to cricket, so I'll take a gamble and say that Little Master Cricket is an accurate depiction of the sport. With an exaggerated physics system you swing a bat at an endless stream of cricket balls. The scoring is structured so that you're rewarded for riskier swings, and the game rarely lasts more than a minute. An artform unto itself.
I'm too young to have played the original Track & Field for NES, but I can definitely see the appeal of Winner Vs. Loser. You play as a track hurdler, controlling both his running and jumping with a single button. It's a tricky balance of timing that takes some practice, but once you get it down it's good times. For those with friends there's a two player option. Speaking of track runners...
Ah yes, we come to QWOP. A sports title that ends up becoming a slapstick comedy. Normally unresponsive controls are aggravating, but they're a source of hilarity here.
There's also the puzzler Evacuation, but thinking makes me brain hurt.
I have nothing but praise for this dude's work, if you haven't checked it out yet by all means do so.