That would be next week…
I know for many of our ISVs the following holds true.
Which I suspect means that there are a lot of ISV products running beautifully on SQL Server 2005. Importantly the fact that mainstream support is ending is highly unlikely to be noticed by these applications who will more than likely continue to run beautifully on SQL Server 2005.
But… it is important to know that extended support will be your only option after next week.
You can find the details here.
If you want to find out about support for any other products then have a look at this website http://support.microsoft.com/gp/lifeselect
P.S. I know some of you think (as you have told me so!) that SP4 changes this. It does not. E.g. Aaron corrected himself.