The upcoming Twistpad 2.1, will support the new Taskbar tabs feature of Windows 7:


Click to zoom

There are a couple of limitations due to the fact that Twistpad is a MDI applicaion:
- Previews are a bit blurry, this is due the old API used to take a screen-shot of the MDI Childs.
- There is no peek when hovering the previews. again MDI related.

Hopefully this will be improved in the future.

Also note the Breadcrumb navigator on the file browser which totally replaces the tool from version 1.x2.0:


No ETA at the moment, but should be this month.