TreeSheets, a programmable spreadsheet/mindmap/PIM crossover

Wow! this is so awesome! Thanks you!

For the past two months I've been daydreaming about embedding a spreadsheet inside a single cell. It can be represented easily with XML, but it's a PITA to work with XML manually.

This is such an great interface. I love that to insert a grid within a cell, you just press 'INSERT'. And to insert a new cell in a grid, you just move the cursor between the cells and start typing.

Very well done.

Edit: Also, I love the HTML and XML export. This means I can actually use this at work. Any plans of adding a scripting interface? I think Scheme or Lua would work well for this.

We're long overdue for a new direction in spreadsheets. (It's disappointing that Apple's Numbers and Google Docs Spreadsheet are so uninventive.) Is anyone aware of other 'experiments' like this?

Wow, the concept and screens look great, but I can't help feeling a bit disappointed when I find out the latest OS X version is from late 2009.

I would love to put some time into it as a hobby project, but the source isn't available :(