I've been using mostly keyboarded devices for some time now, since the last PDA I had without a keyboard was a (long since disappeared) Sony Clie N700C.
Its successor, the Sony Clie NX70V had a full-featured (but poorly designed and almost unusable with the clamshell design of that PDA) keyboard, but I was still mostly using Graffiti at that time.
Then I jumped in the Smartphone train, and got myself a Treo 600, with a really nice keyboard and input scheme.
The next PDA I got was a Sharp Zaurus SL-C3000, and it's keyboard was nice, almost as good as the Psion 3a keyboard I had back in time.
I won't mention the three months I spent using a Fossil PalmOS PDA watch, keyboardless, of course, as I would never have entered any text at all on such a tiny device, but the Qtek 9100 had a very decent keyboard, even if the OS really wasn't my cup of tea...
So now, when I decided to see what Symbian could do for me, it's without any hesitation that I wen for the E61 with its azerty keyboard (yeah, I happen to be French and to have a lot of French text to deal with, so sticking with a French-localized keyboard was the safest choice... <vbg>😉.
And Steeve, I do agree with you, the full keyboard (vs T9-style input) is really what makes the difference between "productive" and "gadget" style of use. Not that smartphones that lack a keyboard are just toys, mind you, but if you really use them a lot to enter text in true mobile situations, like a road warrior, then having a builtin keyboard (preferably one that can be used with a single hand, at that) is a blessing when compared to bluetooth separate keyboards or no keyboard at all.
Too bad that the "business" aspect of the full keyboard means that Nokia got rid of the digicam on the E61, as I would really have liked to get both, but in the end, if I have to chose, the builtin keyboard wins without the slightest doubt!