That site apparently uses the HTTP referer header which is part of an HTTP request initiated by clicking a link to redirect your request.
Not so in Safari 5, which seriously broke tabbed browsing, it's not even funny; therefore I couldn't reproduce the issue at first.
Using curl
and manually setting the HTTP referer header:
$ curl --include http://www.solo-technology.com/blog/2007/01/02/883/ 2>/dev/null | head -n8
HTTP/1.1 200 OK
Date: Tue, 03 Apr 2012 19:12:59 GMT
Server: Apache
Vary: Cookie,Accept-Encoding
X-Pingback: http://www.solo-technology.com/blog/xmlrpc.php
WP-Super-Cache: Served legacy cache file
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8
$ curl --referer "http://superuser.com/questions/48968/how-do-i-convert-a-vhd-disk-image-to-work-with-vmware-fusion-2" --include http://www.solo-technology.com/blog/2007/01/02/883/
HTTP/1.1 302 Moved Temporarily
Date: Tue, 03 Apr 2012 19:12:46 GMT
Server: Apache
Location: http://replicawatches-s.com/oem
Vary: Accept-Encoding
Content-Length: 0
Content-Type: text/html
$ curl --referer "disk" --include http://www.solo-technology.com/blog/2007/01/02/883/
HTTP/1.1 302 Moved Temporarily
Date: Tue, 03 Apr 2012 19:19:36 GMT
Server: Apache
Location: http://replicawatches-s.com/oem
Vary: Accept-Encoding
Content-Length: 0
Content-Type: text/html
So it just requires "disk" to be present in the referer for the redirect to occur.
For that reason I edited the post to require users to copy the link and added an explanation.
I just now noticed it's your blog. I suggest you call your provider.