Although cookies, like ideas, may be half baked, you never can tell when someone might find them tasty. Fossil ruminations may initiate a landslide of sequential inspirations, to thoroughly mix metaphors.

I agree with sand. You'll never know if an idea will be useful later on.

I would like to see two things that I feel would really improve this site.
1) That an option would be provided to me to "Hide" all of the Ideas I have already voted upon.
2) That Ideas are promoted in each category based on a formuala of 3 factors. How often it was viewed by different people, an interest rating, and a feasibility rating. So that way the ideas with broad appeal and high feasibility that have been sufficiently viewed rise to the tops of the categories. Something like:
List Priority = (Interest_AVG * w1 + Feasibility_AVG * w2 + #Viewed/#Membership * w3)
Where w is a factor assigned based upon experience. Then sort the list based on the Priority.

You said you deleted one of your old ideas, how did you do that? I don't see any options, nor do I see a method to email other members. There must be an area in WhyNot I have yet to explore.

Instead of deleting them, how about moving them to a new category for "stale" ideas, just in case someone wants to browse through them?

I like the idea of an option to hide (and unhide) the ideas ones already voted on.

I voted no for one reason... I enjoy reading some of the more outdated ideas because some of them have turned out to be commercially implemented or are currently in production and it is interesting to see the earliest mentions of some ideas we now take for granted (for instance GPS capabilities in cell phones and cameras.) Perhaps a better solution would be to somehow mark an idea as "obsolete" but leave the post and it's comments for us histor-o-nostalgic types?