I was debating another possibility which would be to go with something similar to reddit gold.. where effectively you can buy credits and "gild" a particular post/person for helping you out for 1 credit. Reddit gold is like our gdnet+.. which has pretty much the same lack of any type of useful feature but is pretty much a "support the site" type of thing.
The biggest thing I'm working on is trying to consolidate / trim / remove any extra cloud servers and services that aren't 100% necessary. We just dropped VerticalResponse for our newsletter and instead went with http://sendy.co/ We did a test last Thursday and it worked absolutely perfectly.. so that will save about $1800/yr.
We can operate on a single 4CPU SSD server with at least 16GB ram (ideally 32GB) at this point and we need backup services. We run a few single-purpose servers that run at $35/mo but with the resources they use we could move to Linode and move to $10-20/mo servers. That would save about $1080/yr.
In any case, adsense generally sucks for revenue anyway compared to sponsors so the biggest thing is getting legit sponsors. I think ads can be a positive thing if they are actually things people are interested in and may not have known about.
The IPS software vendors are gearing up to launch their 4.0 version of the software (which we will not be migrating to for a long long long time) so today apparently a number of services they run (including chat) have been affected by some revisions to their software. From what I can see they've managed to resolve chat issues at least.