Since being awarded a grant from NSF (my first!) I have received a few requests from strangers at other universities, who are themselves seeking funding, to see a copy of my funded proposal. Initially I reacted negatively to these requests, thinking that somehow the "secret sauce" of the successful proposal would be weakened by sharing it. However, I now feel that sharing a funded proposal has the following benefits:
It increases my work's exposure and may lead to complementary research by another group;
It may lead to an opportunity for collaboration.
The major downside is the prospect of plagiarism-- that the stranger would use my text in a publication. Of course I am planning to do that, but they should not since I would probably find out sooner or later.
If it is appropriate to share funded proposals, then the next logical step is to make the entire proposal entirely public. Here it seems like there is significant opportunity to weaken my chances of getting future funding-- but I can't say exactly why I feel that way.
What do other SE readers think of this? This may be appropriate for community-wiki.