Don't panic - there is a fix - it just hasn't been written yet. TLS 1.1 and TLS 1.2 exist which are not vulnerable to the exploit. However they are not supported by major browsers or web server distributions. I suspect this will rapidly change and support will appear in the next month or so. Also - the exploit is not public and I expect it will be kept a secret for as long as possible.
What to do?
For internet users: Make sure your browser, email client and operating system is bang up-to-date and apply updates immediately as they become available! If your preferred browser is slower than others in getting a fix then temporarily switch to one that does have the fix.
For website owners: If your using SSL at all e.g. ecommerce or email then get onto your hosts once a fix is released and make sure they are going to implement it ASAP. If they are not going to update then move to another host.
For web hosts: Keep your customers informed and hope a fix comes soon!!
I will try to update this post with info on browsers and server software as and when they begin to support TLS 1.1