Reload Problem, user tend to submit data twice

[eluser]Carlos G[/eluser]
so, wich is a good solution for the resend of the POST data when usin the F5, because the simple redirect it's not enough, i'm having problems where fool users are using the back button and F5, this is making weird data and users fools and unhappy with the reports

So is there a good technique to avoid this simple situation??, the rails or asp users wath kind of technique are using???

Thanx in advance