You should check out the Garnet Palm Pilot emulator. You can bring any Palm apps that you can't live without straigh across.

• Sign up for a skype account (don't use an underscore in your username), and buy a bit of credit to "skype out". You can then make international calls on the go to anyone you now call.
• Passwords -> pwsafe. Calendar -> built in, or GPE calendar, shopping list -> xournal or maepad.
• Music: Your MP3s will come right across. You can listen to last.fm or Pandora in the web browser.

I do web browsing on the N900, an iPod touch, and various PC web browsers when at home--so it is usable even when you have the option. For longer sessions, I use the big screen and the full size keyboard, as you'd expect.

As far as readability, it depends a bit on the webite. But with the new firmware (51-1) you get a partially complete portrait mode browsing as well, so you have two different viewports to try and get the sizing right. There's also the menu setting of "text:large", but I don't use that myself. For this site, when I read it on the N900, I us the control panel and set it to "minimalist-dark" and read in portrait mode.

Have you yet been always connected? It grows on you.

Honestly, part of the reason I have it is my commuting pattern -- the train and tube journey into London isn't quick, and I like to web surf and send emails on the move. If I still had a 20 minute drive to work I'd not need it for surfing or email :-), but I'd still want it for streaming music and streaming Internet radio. I often listen to French news, and I'd definitely do this on commute that included driving.

I think you'll find the always connected aspect something you wish you'd grabbed earlier if you wait. When I get to a restaurant half an hour earlier than my wife (who left work late) I can login to my computer at home via the ADSL connection, and start a download. Check my email. Use skype to call family back in the US. Pull up a copy of Google maps showing traffic, and tell her that she'd be better getting of an exit early as the next junction appears to be a worse mess than normal.. All this regardless of whether the place has a WiFi access point...