We've just started a blog on Scotsman.com called Under the Radar (http://www.scotsman.com/undertheradarblog) which aims to give a platform for up and coming Scottish music.
One feature on the blog is a collaborative gig calendar: http://www.scotsman.com/CustomPages/CustomPage.aspx?PageID=78325
It just runs through Google Calendar, so if you would like to add events, contact me at [email protected] with your email address and I'll send you an invite.
Cheers,
Nick