Only just seen this. I'm shocked to say the least, as I haven't been reading PerlMonks or London.pm for a few weeks. Ivor was one of the good guys and I've very glad to have know him. I have good memories of him trying to convince me that I should try some Real Ale instead of Guinness :)
I meant to catchup with him at a London.pm meeting more recently, as he was missed at YAPC::NA 2008. For the previous 3 years he and I were pretty much the regular Brit attendees. Our last sightseeing expedition was with Karsten, Cog and Abigail at the NASA Space Centre in Houston (here Ivor is second from the left).
Farewell my friend, you'll be missed.