I use a different program than MediaConverter, but IMO with any of the converters out there (almost all of which are wrappers over ffmpeg), it is a good idea to keep the same frame rate in the output...
I like tabs just fine, but having them is very low priority for me considering the early beta state of the browser. I'd rather the developers focus on other things for now and revisit the tab issue...
The funny thing about the iPhone is that it is what made me aware of the N800. After all the iPhone hype, I got to thinking I'd really like a system like that but without all the cellphone garbage...