TrueCrypt might not be the best option, if you plan on having the image mounted in several machines, due to sync issues as mentioned by sibling posts. If you're on *nix, encfs is a better solution, as it works individually on each file, and can handle the updates without remounting.
i haven't much used the gtalk audio/video calls, but I don't think it has multi-party calls, screen sharing or PSTN integration, both for dial out and dial in (except maybe through Google voice? But even then it'd be US only).
The basic components might be there, namely the actual video calling and the huge user base, but I wouldn't call it a strong competitor for skype just yet.
That's true, but when compared to the source material, the movies (even good ones) tend to pale. I guess when making them out of something which contains much less story than a book (such as a game), there isn't really any good way to come up with good movie content.
Skype calls and IM worked out of the box on the N900 since day one. What are you talking about?
The video calls are new. I've just tested them and they work with skype and gmail with no issues. I haven't tried SIP video yet, though.
Probably you'd see a similar distribution, but shifted somewhat to the right. Although we have our share of stupid people making stupid comments here, head over to youtube, digg, or some other "wider audience" site and you'll find whole new levels of stupidity.