After this thread Im concerned I have anyway - you want some sources you say...? Engadget: http://www.engadget.com/2010/01/19/nokia-n900-review/
If nothing else, Maemo 5 is pretty -- Nokia's prettiest platform ever, in fact, by a wide margin. We're sure that's due in no small part to the fact that the N900 is the first in the company's Internet Tablet line to employ a modern ARM Cortex A8-based core, making screen transitions and effects fast enough to accomplish their intended function: beautify the UI without sapping away precious seconds of the user's time. Out-of-focus screen elements are actually visually out of focus, which looks great (photographers, think "nice bokeh" here) and applications zoom and fade as you open, close, and minimize them.
Almost without fail, sites were rendered faithfully (just as you'd expect them to look in Firefox on your desktop) with fully-functional, usable Flash embeds -- and it's fast. Not only is the initial rendering fast, but scrolling around complex pages (Engadget's always a good example) was effortless; you see the typical grid pattern when you first scroll into a new area, of course, but it fills in with the correct content rapidly. To say we were blown away by the N900's raw browsing power would be an understatement
As a daily workhorse smartphone for your average Jill or Joe, it's impossible to recommend the N900 at this point; it's just missing too much functionality that's waiting to be written by some enterprising CS grad students with spare time on their hands. As a second, dedicated browsing device or a geeky weekend hobby, though -- possibly an upgrade from an N810 -- the N900 is a very compelling device indeed.