I did notice Google not indexing or crawling either on the penguinized sites, its almost like we're in a penalty box until a certain time.
It will just have to run its course. If Penguin is iterative like Panda, it could be weeks before we see an update. I've never noticed sitemap resubmissions or crawl rate adjustments having any impact on the duration of penalty. Just my experience, and I have had to "wait out" my share of penalties on different sites.
Out of curiosity, for people who were victims of Penguin, how do your rank for plural / singular variations of your keyword(s) that were hit.
Planet13, I started seeing ranking differences between plural/singular over a year ago...significant differences. Very frustrating at times. I'd be page 1 for one version, page 4 or higher for the other. I think it's just the phrase-based scoring, but I don't know if it was turned up a notch with Penguin. Just sharing my observations for the past year.