XSEDE is the computational infrastructure for iPlant
(http://www.iplantcollaborative.org/).
iPlant is a bit like Galaxy — it’s supposed to be a user-friendly interface on top of the raw hardware.
http://www.iplantcollaborative.org/discover/discovery-environment
iPlant is NSF’s version of DOE’s kbase; they literally have identical goals.
https://www.xsede.org/web/guest/overview
https://www.xsede.org/web/guest/using-xsede
https://www.xsede.org/tacc-stampede
400G per user (multiple users allowed),100k CPU hours for start up.
linkstream2 microblog 
Best to comment on twitter via @markgerstein. Only use this space for comments that are untweetable!