Not only avast flags it, also Bitdefender Traffic Light url scanner says it is unsafe,
see: http://forum.bitdefender.com/index.php?showtopic=26497
suspicious activeX control id:
D27CDB6E-AE6D-11cf-96B8-444553540000

Also urlQuery gives

Reputation Suspicious [1/7]

This malware was found: PHP/Rst.H.95982 (response now dead) (so your site had issues in 2010 also)
http://www.virustotal.com/file-scan/report.html?id=6e110852e4e7ea1ff08c7fb37736ef8d2bb82de776498c070ae9b66eadd24d37-1286532710

polonus