Musicians and bands: Slainte | The Border Piper

Learning: World Fiddle Music - Violin Techniques | Sheila Joynes - online theory lessons

Internet radio: Hober - eclectic selection of music from station based near Washington DC, USA (RealPlayer required)

Communities: Irish traditional music - but also any folk-related: The Session | Violinists - intstruments, enthusiasts, players: Fiddleforum

Resources: Violin and Viola - String resources for the UK