I have been using QR Codes quite a bit recently to record location data for books at a local university library. I find them to be a fantastic tool. It looks like they will be here to stay too.
Mashable has a nice cloud computing for dummies overview here.
I’ve been noticing the use of HT in tweets recently, and wondered whaa that meant. Turns out it’s code for Heard Through, in the same way the RT is code for ReTweet. Here is one of many handy explanations of other Twitter slang.