Atlanta, GA - better than you imagined it would be.
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Yes, It's true. Most likely a problem would be if you had some php5 apps that won't run on php4. Your php 4 apps should be fine on php5. I think there are only a few things that are not supported. Here's a list.
Also, using the method we discussed above, try things out in php5 by modifying the .htaccess file first - that way you will know for sure. Do it late at night or a time when traffic is the least affected.