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[driveflexfuel]

I am a completely new site design and I am receiving calls from customers saying my site is not working properly because their computers are loading the old site form their cache.

Does anyone have any suggestions for making this an easier transition?

The only thoughts I have so far is inserting a temp code like a meta redirect/refresh

or
php header( 'refresh: 0; url=http://www.example.net' );

[diabolo]

probably only tell them to clear their cache, I'm not really sure how to do this auto. maybe clearing all cookies or something iuono

[scopey]

They should only load a cached css file... If your CSS file has the same name as the one on your old website, change its name and then the user will be forced to load the CSS scripts again.

If it isn't because of the css file, then it's the users own fault for using a bad browser. They will have to clear their cache by themselves.