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If Good Ideas is at core a database of ideas / wisdom, should it employ an "Ask Jeeves" interface to humanize the question / advice interaction?
People are submitting ideas to many sites, but nowhere are the ideas rolled up into on "my great ideas" capacity. XMLRPC. (Suggested in user feedback).
This part is particularly obvious, but I'll add it anyway. If you want a large number of people playing, a simple Facebook app is going to be a must. Signing up for an idea then becomes part of someone's stream and the viral magic kicks in. It's also a good way to drive Facebook traffic to websites associated with the good ideas. Then, of course, you have access to Facebook's toybox of viral techniques to grow participants and direct traffic.
When an idea becomes hot, people are very quickly going to want to create a "project" out of it. This may be something you are avoiding, and there are other sites to create and run projects. But it's worth thinking about whether you want to allow a hot idea to be captured as a project. A project page wouldn't need to be anything more than a Wiki page with some content pulled automatically from the web based on title or keywords (Squidoo style) and the rest added by project members or the project leader.
While I appreciate the idea of tossing good ideas into the ether to see what happens, I feel like this could be done more effectively with a twitter hashtag that feeds the Good Ideas website. You could still add voting, tagging, etc., which are important elements.
For each idea and person, lists of similar ideas and people could be displayed. Similarity of people might be easiest to determine, based on how they vote. With enough use of tags, similar ideas can be found. Or, like Amazon, suggest other ideas that most (similar) people have suggested who liked the current idea.
Need views of people, pictures, interests, etc. And each member should be able to optionally make their ideas, comments, and votes visible publicly if they want, or keep them private.

Showing summaries of votes would be votes would be particularly interesting. There are many ways to show summaries of how groups of people are voting as well.
You might click the wrong thing accidentally after all. Or you might learn more and change your mind later.
It would make the site more people friendly if you used the Gravatar service so that thumbnail photos appeared next to people's names.
Don't know how hard this is to do, but it'd be nice if each offsite link opened a new window, so i can browse the ideas without having to hit the back button and/or leave goodideas.
Perhaps the site could use a "slogan" or "tag line" to help explain what it does? Here are some possibilities;

* "Where good ideas go to live"
* "Innovation. Wisdom. Good Ideas."
* "The Web's Wisdom Archive"

Any of these work? "Flickr for Good Ideas"? Others?
Syntheses of best ideas, including trends, could be on the blog as well as sent as a monthly newsletter.
Rank good ideas by "top rated" and "recent", but also offer a "stars" category which allows people to buy stars for placement (similar to bidding for Google AdWords placement).
Hold a monthly competition for best ideas in different topics, perhaps with cash or donation prizes.
Use GoodIdeas.org to generate good ideas for t-shirt slogans and then market them. Revenue can help support the site.
Does this database of good ideas make sense? Any suggestions?