Mida is a VCL to FireMonkey converter I've used and already blogged about. it is written by an Italian (Mauro Botta) who presented it at length at the recent italian Delphi Day. I've tested it on different types of applications, starting the early releases, and I've been impressed by the quality of the conversion. I did get a free version and know the developer, so I might be a bit biased. But I tried my best helping him get in touch with Embarcadero, so I'm very pleased about this result.
Here is an image of the Delphi Day presentation:
If you are a registered use of Delphi XE2 (or RAD Studio XE2) you can get the tool (free) at http://cc.embarcadero.com/Item/28943. Tim Del Chiaro has posted a short description on his blog at. http://delphi-insider.blogspot.it/2012/07/free-mida-vcl-to-firemonkey-converter.html
And in two weeks there will be a webinar, hosted by Anders Ohlsson about converting your Delphi VCL applications to FireMonkey with MIDA, described at http://edn.embarcadero.com/article/42428.