I would strongly advise everyone to max out their ESPP contributions (you can contribute a maximum of 15% of your salary, up to the IRS mandated $25,000 limit). Why? Because it's a amazing investment that, if you sell stock immediately on reception, is risk free. I'm going to assume you know how ESPPs work, google them if you don't. Let's do the math: consider a typical ESPP (yours may vary) with a 3 month purchasing…
(Source: saw it happen.)
The good thing though is that you may withdraw all the money until a few days before offerring time end. Useful in situations of uncertainty like here.