This past "startup" weekend, we got a chance to bounce our idea off a bunch of different people. I got some really good feedback and wrote down every suggestion I received as soon as I could.
Let people know what you're doing so you know if you're doing something worthwhile. Remember: if they don't get what you're doing, it's certainly not their fault. Don't get haughty and cry that they're not sharing your vision. Let a potential user tell you what they want.
I really like the focus PG now has on funding groups with quality people, not just an impressive demo. I was very surprised when I heard him say they will accept applications with the idea "I have no idea". The realization that you can have an outstanding group of founders but not a complete product yet and still get accepted into YC is very encouraging. Startup ideas often change and he recognizes that.
I just hope this still remains the case with SO many applications (most with solid demos I imagine..). Its probably very easy to get lost in the sea of impressive startup demos.
Let people know what you're doing so you know if you're doing something worthwhile. Remember: if they don't get what you're doing, it's certainly not their fault. Don't get haughty and cry that they're not sharing your vision. Let a potential user tell you what they want.