This poll means nothing. People just have to change their nickname and their application name and we could believe it's an all new entry, while it's not.
The clear thing would be:
1) Don't take (so much) in account the people's vote. They can be and ARE cheated!
2) Open a special thread during the competition. Everybody who sees an unfair entry, like for example another app done by another coder which is strangely similar to BeUp (which is open source). Then if people can prove the entry has cheated, this would be taken in account by the judges which would HAVE to read that thread. They would give less points to these entries.
Also, I think the same application should be allowed again only if a LOT of things changed. We can always encourage coders to continue working on their projects, else they'll stop them once the compo is terminated, and they will never be improved, bugs will not be corrected, and so on. This is a bad idea.