Maybe it is just me...... I can't access website, forum or contact my webhosting company (they have disappeared as well).
Any thoughts on how to check? Like tracking down the nameserver and pinging it?
Technobimbo
Edited to add that it has been at least 6 hours now since I disappeared into the Bermuda Triangle....

Use tools like tracert to verify you have an internet path from your workstation to your web server. There may be some internet outage between you and them that's causing the problem. Also if you can check from a different location using a different internet provider.
Another possibility is your host is having some major problem at their location.
I'd start with a command line and first do nslookup on your url, make sure you get the IP resolved properly and you don't have a DNS problem.
Next I'd run tracert to your url and see if you can get to your site IP. Sometimes you won't see your final IP on tracert though, so it's better if you've run tracert in the past and know what results to expect.
If these tests pass you may have some malware/virus on your machine causing problems.

Thanks. I've tried 3 different computers with 3 different ISP providers. And these are the only websites I can not access.
Will try the trace thing when I get home..

What's the name or the url of your webhosting company?

Problem was likely with the name servers. Names were not resolving.

Thanks everyone. The problem appears to have resolved itself.
I may look at getting alternate nameservers in case this happens again.