Worst case scenario, this is all you get for your entry fee and months of waiting:
Thank you for submitting your film to the 2007 Sundance Film Festival. Unfortunately, we are not able to include it in our program this year. Please know that it was carefully considered by our programming team, and the decision was incredibly difficult to say the least. This was one of the most competitive years on record, with so many deserving films vying for the very limited space in our program. I know that this is no consolation, but we are forced to make many difficult decisions when making our selections.
Please do not let this decision discourage you in any way. I would like to wish you the best of luck with your film, and we look forward to having the opportunity to view your work in the future.
Director, Sundance Film Festival
UPDATE: Here's the one from Slamdance:
Dear Feature Filmmaker,
I regret to inform you that your feature film was not selected for the 2007 Slamdance Film Festival.
This year Slamdance received a record number of feature film submissions. The Slamdance narrative features committee were continually impressed by the high standard of filmmaking. Our programmers watched every submission multiple times, and were taken by the incredible achievements from the independent filmmaking community. We regret that Slamdance cannot screen more films. This was an incredibly difficult decision for our narrative features committee.
We greatly respect the tireless effort that went into creating your film. Please keep in mind that all film festival programming is entirely subjective, and not being selected by a festival should not be considered an indication of whether or not your film will succeed.
Thank you so much for sharing your film with us. I wish you all the best with your future festival applications, and ongoing filmmaking career.
Director of Programming
Slamdance Film Festival
Wear 'em like a badge of honor.