Instead of telling you my SXSW favorites I will mention the rest of it:
collecta.com
Just have a look if others have written something about what your are searching for.
Go Try It On
Get an opinion, give an opinion. If you do not know whether your panties fit or not, others will know. Sure!
Nutshell
This tool really helps to get rid of all that brainfucking real time informations. Thanks to nut’s hell everything will be canalized in your plain old email inbox. The next evolution could be your neighbor telling you all that personally.
GuruStorms
So called guru storm is a helpful solution to buy in creativity. Ask a simple question, tell the crowd what you would pay for a solution and wait what the brain thunder will left over.
place things
That’s a wonderful solution to dispose data in public space. place things let you link your personal data trash like virus, malware and other snippets on real places. The garbage collector will be called “pickUpAllThat”.
challengepost
It’s like the guru wind: you want someone to do something really challenging? Say what you’re willing to pay for it and someone might be your slave. I could imagine that almost of the so called challenges will be limited to virtual goods. The “post a wish” function reminds my on Christmas.