I've got an odd one.  I'm getting the error:

Object reference not set to an instance of an object
on nearly every control on my page.
It seems to happen every time i invoke a <%$ %> tag,
So, 
text="<%$ Resources: Resource, Home %>" 
or
ConnectionString="<%$ ConnectionStrings:EStoreConnectionString %>"

Just started happening in the middle of the day.  Far as i know, i haven't 
installed any plugins, or anything for the matter between it working and not 
working.

I've tried repairing Visual Studio, i've tried uninstalling VS and 
re-installing.

Its a vista machine, so i can't uninstall .NET Framework 2.0 because its 
built in.

Any ideas?

This only occurs in Design View and doesn't occur on excution or show any 
errors in Markup View.

I'm using VS 2005 SP1 with the Vista SP1 update.

Thanks for your time,
Frazell Thomas