Desert Island Discs are easy to find (like who would get on a desert island with a record anyway?), so how about Holy Grail Discs? These would be albums that are very hard to find, maybe not even bootlegged if they're unreleased. I can't even put them on a wishlist. Here's my list:
Jim Diamond - Live at the Shed (see Al Chantrey interview) - Someone in Scotland has it and will copy it for me.
cut._ - Millionairhead - Though on Ray Wilson's site, still a pricey find.
Denny Laine - see earlier article
Seal - Togetherland - see earlier article
Duran Duran - Reportage - see earlier article
Savoy - Velvet CD5 - With B-side "October" (a-ha cover)