Unless your site is going to be public, I dont see any problem with it.

If it is open to the public then potential hacks could manipulate scripts on your site.. for example

[script on my site]...

Wow, they now offer server-side options. I havent used any of those services in a long time. I got hooked up with payed hosting long ago since they had better customer support and service. :o

The Zend IDE is pretty nice, the best I have been able to find yet.

Well basically if you are editing FormMail.pl you could just download it then open it up with notpad, then make the correct adjustments there. Geocities does not run any server-side software (PHP,...