First, I just want to thank you for creating an excellent, excellent product.
I cannot wait until you produce a Pro version of it, honestly and I would be more than happy to pay whatever for it.
Here is some constructive feedback for future versions that you may consider for Pro Versions:
• Bulk Processing: Basically background processing of the evaluation tool that doesn't automatically direct you to the keyword evaluation page. The workflow would be more efficient if these were staged in a staging area, though this would obviously be performance intensive.
• Projects: Obviously storing keyword research projects would be great, so when you click on the keyword tool you don't suddenly lose your session.
• Geo-Intelligent difficulty ranking: I love the display, however when you are working in a specific country (ie: Australia) and you get "69, don't bother" for a long-tail keyword with all *foreign* websites (ie: American), then it's a goldmine actually because it is far easier to take down a Wikipedia or Moz article than a dedicated local competitor, despite the authoritative status of those websites in reality.
I love this tool, it is far better than, say, Market Samurai at competition analysis and far more usable. Once you have projects and other features, I'll probably have this open in a tab at all times.