National Seal Rescue Centre - Gweek, CornwallOceanswatch
Green volunteers - No official site, but some details on the orkney seal sanctuary website
Sherkin Island Marine Station - Southern Ireland, Co.Cork. Take on volunteers April to September: diving, otter, intertidal surveying
The conservation volunteers, practical based conservation work, training courses and leadership courses throughout the UK and overseas (overseas volunteers must be over 18. Address: 36 St Mary's Street, Wallingford, Oxon, OX10 0EU
New Scientist Jobs - sign up for specific posts
Nature Jobs Science Recruitment site
Jobs.ac.uk you can sign up for a weekly email of relevant jobs.
Times Higher Education Supplement (have to subscribe to access though)
Marine Conservation Jobs
Centre for Conservation Biology Network (CCBN)
Jobs in the Wildlife Trusts (UK). Each local area has a wildlife trust which can use your help and skills, often help is needed by volunteers in the offices and also on surveys or a range of other work, this link shows the jobs (some paid) available at the trusts, Local Trusts addresses and sometimes websites can be found from this website too. The work is usually not marine based, but can be.