Some of my favorite links are:-
General
North East Moths - Useful site for info where you can see what is flying
Macrolepidoptera of Durham & Northumberland
Yorkshire Butterfly Conservation Website - includes recent sightings section
Yorkshire Moths - Yorkshire Moths, internet discussion group and butterfly plants
Mostlymacro - A new moth blog from Dean Stables in Barnsley area, South Yorkshire
Mothing Equipment
Anglian Lepidopterist Supplies
Bulbs Lamps & Tubes Direct - worth checking for bulb prices
Moth ID Sites
UKMoths - Great site for ID'ing moths
Jeff Higgott's Moth Site - Another good moth ID site
Leicestershire and Rutland Moth Group
Bird Tours
Schiffornis Bird Tours - a few pictures of moths taken on one of their Costa Rica trips below