Looks awesome, great with multi-engine support. I'd love if you could open-source your two-pane approach to IPython... I really like IPython (and have been working with IHaskell lately), but I find the RStudio approach much better... having my code on the left, moving up an down and executing lines with Cmd+Enter, running entire cells (knitr Rmd style), seeing graphs and documentation while you're working, etc...
Glad you like it. The IPython engine isn't open source at the moment, but that may change in the future. Out of curiosity, if it were open source, what might you use it for?
For my own work, maybe help integrate it with IPython as an alternative front-end. I don't have a cloud project, I just do my own data analysis/learning with IPython and IHaskell, and think a multi-pane approach would be much more powerful. (I applied for an account with Sense, looking forward to playing with it and providing feedback).
