Meebo's pretty cool, but it's basically just boxes, no real heavy design. What's it written in again? Obviously they had a lot of time and money and programmers to work on it though huh? I bet the coding is huge.
All of it is in Javascript, which I'm sure interacts with a server-side programming language.
Rounded corners are a pain in the neck to do, boxy or not, it's difficult to get a good rounded corner effect, at least, at this point.
All those devices are useless to surf the web except in an emergency. The oqo is only slightly larger, and has the full capabilities of a normal computer, and doesn't cost that much more than most of them. Why would I want any of those when I can have a full sized computer power in a umpc. It's those devices that are going to be on death row. Not flash.
Well, sometimes I'd like Flash to be "on death row". It's the single most common reason that a browser crashes. It's very CPU intensive, so things like netbooks don't always play Flash at a very comfortable speed.
One thing everybody should know about doing anything on the web: it's complicated. With a relatively simple site you may deal with HTML, CSS and Javascript. That's your Content, Presentation, and Behavior layers.
Flash is this plugin that loads into the browser, adds security holes, wastes CPU cycles, and is an impediment to accessibility. Flash doesn't have the separation of content, presentation, and behavior. There may be separation of content and presentation/behavior, but that's messy in comparison.
Sure, Flash seems to make things easier. But if someone doesn't have Flash installed, for security, performance, or because they didn't have a choice, you don't have a fallback. In the case of Flash navigation, that makes your website completely unusable.
The web was designed for universal access, not to be limited to plugins. Most of the reasons Flash used to be used have been replaced by AJAX, (Asynchronous Javascript and XML) which is a way of changing the content of a webpage without refreshing the whole page. With AJAX, the main reason Flash used to be used is pretty much gone.
Sorry for such a long rant, but I just wanted to try and demonstrate why Flash is usually not the best solution.