If you have not been there in person, look what you're missing!
These are the Dolomiti mountains.
K3 Photo Agency is on-line.

Hiking, walking and a little climbing

Local

SentieriNatura
Tiberio Grasso home page

Others

FFME Fédération Française de la Montagne et de l'Escalade (French)
How to buy hiking boots
ViaFerrata.Org (French)
Seiseralm - Alpe di Siusi
GORP (Great Outdoor Recreation Pages)
Alta Quota: alpinismo, escursioni, rifugi, arrampicata (Italian)
Planet Mountain.com - the mountain comes online (Italian and English)
Borntowalk (Italian)
GO - MOUNTAIN the infinite guidebook (Italian)
The (almost) official site of the it.sport.montagna newsgroup
And if there is something you don't understand, you may use this climbing dictionary (Stolen from Carl.Ockier@dlr.de)

Weather and Meteorology

Eurometeo
ilMeteo, medium-term forecasts
Meteo Trentino
Meteo-France: Real time weather and information
AINEVA, Associazione Interregionale Neve e Valanghe
Current Solar Forecast from NOAA. (Well, it's not weather, but it's a forecast...)
Useful formulas for weather and navigation

Other links

Sci di fondo italiano
French ski resorts
Prevenzione in montagna
Zecche - malattia di Lyme

If you know of other good sites or images on the Web please drop me a line.