It seems a bit ironic that the economy is working just fine for many of the people that will attend this gathering, which will make the whole 1%/99% thing visibly inaccurate. "We are the seventy-something percent" doesn't have the same ring to it, though.
I don't see how it's ironic to care about these problems even if we happen to have nice jobs
As far as ideas I think there is a need for a trusted decentralized network for inter-city communication, occupations are sprouting up all over the world and communication would help with the spread of good ideas and coordination. Dave Weiner at scripting.org has been blogging about these types of things this week and is offering occupyweb.org subdomains for webapps.
I support people's right to express their opinion, but when hypocrisy such as demonstrated by these protests reaches this level, I have to call bullsh#t.
I would much rather see a 'Smaller Government Tea Party Hackathon' or perhaps an Occupy the White House Hackathon. The problem isn't the banks it's the government. A government that feels like profits are something to be punished when in fact, profits are the reason innovation happens. No one is forced to have a Bank of America account, but all Americans are forced to pay for bad policies every day. Any time the SIEU is involved in a protest you know the motives are suspect.
(And it's irrelevant if the protesters "use computers" or "use banks". Should they write on parchment and exchange stone tokens with each other? No.)