Well, I finished my trip and wherever I could find a solid connection with wi-fi for the N770, it performed well: using the browser to check Gmail (basic mode working better than normal mode), booking hostels, booking a Eurostar ticket, making VOIP calls with Skype and making/receiving VOIP calls with the Gizmo5/Google Voice combo.

Hardware:

N770
3mm headphones
3mm microphone (compatible with iPod Touch) (found that built-in mic was fine though)
Palm blue tooth keyboard (for typing long emails)
external battery charger (purchased online)
extra battery (purchased online)

Software:

OS2007HE, 4.2008.7-1
MicroB (for better web browsing)
Skype (for VOIP)
Gizmo Project(Voice & IM) (for VOIP)

Installed Applications list:

becomeroot (needed for installing Skype)
gizmo-project (Gizmo5)
libuiw
load-applet
microb-browser
ncurses-base
osso-xterm (needed for installing Skype)
skype-ui (needed for installing Skype)
ttf-bitstream-vera
vim (needed for installing Skype)

Main gripes were speed and battery life, of course...