I spend between 50-65 days on the hill in winter in all weather conditions. I need kit thats well designed, fits and performs in all sorts, from blue sky alpine days to full on arctic winter ones. I am not a sponsored climber, however, the following kit works for me.

I have been wearing Patagonia now for the last 3 years and would thoroughly recommend it. Maybe not for cost.... but for design/fit, performance and the companies environmentalism.

La Sportiva footwear-  Innovation with passion! Great performance mountain boots, rock shoes and running shoes.

                        Weather/Avalanche Forecasts

MWIS - The best mountain weather forecasts.

SAIS - Avalanche forecasts plus lots of good info on their blogs.

MetCheck -  UK weather forecast from 3 days to 300 days.

BBC weather  - New website with a great rain raidar.

Met Office - National mountain forecasts.

Synoptics - Wetter3.de  - Comprehensive european synoptics

Frontpoint - Find out those all important climbing conditions.

Travel & Accomodation

VisitAviemore - Eating out, transport & accomodation.

Ecosse.net - Accomodation, travel, weather etc in Lochaber, online accomodation booking.

Highland Hostels - Independant hostels guide for Scotland.

National Express - Bus and train timetables and online bookings.

Travelsupermarket - Flights and car hire.

Insurance

British Mountaineering Council - BMC - UK climbing info and dependable insurance.

Snowcard Insurance Services  - an alternative to the BMC with more options.

Organisations

MCofS - The representative body for hill walkers, climbers, and ski-tourers who enjoy the Scottish mountains

MIC Community - The Mountain Instructors Community is a collaboration of independent climbing instructors who provide climbing and mountain skills training throughout the UK. 

The Association of Mountaineering Instructors - The AMI is the professional body for qualified Mountaineering instructors.

Climbing

UKClimbing.com - Info and forums, where you can post til your harts content

Plantfear - Leading adventure sports resource and online shop.

Scottishclimbs - News, discussion forum, competition results, guides to trad, sport, and bouldering areas across Scotland, photos and articles. 

Mountain Biking

Scottish Mountain Bike.com -  Comprehensive site with everything you need for planning a bike trip to Scotland's mountain bike centres.

MTB Scotland - run by mountain bikers for mountain bikers.

Chain Reaction Cycles - the World's Largest Online Bike Store, great deals and free shipping.