I owned a nokia n82 before the N900. The N82 is a fantastic and wonderfully flexible phone, even today IMO(with the right software). I was actually really looking forward to using it alongside the N900 to fill in the gaps, but the camera got a really bad bug all of a sudden. The camera itself became temperamental so it doesn't always activate regardless of the cover being open. Too bad.
N900 has kept me very content though.

I just sold a blackberry 9000 , HTC HD2, nokia 5800 nokia 6300, nokia e90 ans samsung FGH380 all in favour of the n900 and so far n900 owns them all. I have to say though that the samsung did have an excellent screen and feel to it and there is something i will miss about it,,,everything else i hrdly used such as e90 and blackberry,,the HD2 was too hard to change the way you wnated and bugged too much

I used SonyEricsson G900 as main phone....still love NineHundred series Phone.....

Alcatel one touch easy db> Ericsson T20e > Nokia 3310 > SonyEricsson t68i > Nokia 6280 > Nokia N70 > Nokia N95 and today Nokia N900

Motorola C115 > One of the firsts phones with LCD's, it was Siemens > Motorola V3i > Motorola Z3 > Samsung A737 > Nokia N900

E90 and still better than the n900 by far.

whoa lots of nokia fans here, seems a majority of us had a nokia symbian headset before the all mighty n900

Nokia 7650-Nokia 9500-Nokia 9300i-MDA1-MDA2-HTC Universal-HTC Advantage-HTC HD-HTC Touch Pro 2-HTC HD2-N900

don't remember all of my phones (there were some in 14 years...), but I think the following list sums it up pretty well:
some forgotten plastic brick in 1997 - Alcatel One Touch Easy - Sony CMD J5 - some Panasonic whose name I don't remember (was broken too soon) - Siemens M55 - Sony Ericsson W910i - Nokia 5800 XM - Nokia N900

Great Mostly, previous Nokia users have bought N900.
I had E53, E63, E75 and now N900. Though I am missing front QWERTY in N900. It so much easier with front QWERTY. Nevertheless N900 is best phone I have used ever.