ICAO / Eyjafjallajökull eruption follow-up page
Establishment of International Volcanic Ash Task Force
Follow the news on the website of the ICAO European and North Atlantic(EURNAT) Office
See it in pictures:
Here and  here
Related Links and Documentation:
ICAO Doc 9766 – Handbook on the International Airways Volcano Watch (Operational Procedures and Contact List)
ICAO Doc 9691 – Manual on Volcanic Ash, Radioactive Material and Toxic Chemical Clouds
ICAO EUR Volcanic Ash Contingency Plan – ICAO EUR Doc 019
ICAO NAT Contingency Plan – ICAO NAT Doc 006
VAAC London (includes links to latest volcanic ash advisories)
VAAC Toulouse (includes links to latest volcanic ash advisories)