They've been on sale since the 25th, and it'll end on the 27th (tomorrow). Pretty good deal, can't go wrong with 50 freebies. Here's their list of apps:
iPhone:
http://www.ensenasoft.com/index.php/products/iphoneapps
iPad:
http://www.ensenasoft.com/index.php/products/ipadapps
Mac:
http://www.ensenasoft.com/index.php/products/macapps
Some really good casual board/card/word games. Been playing some this morning.