Just some general thoughts:
We're okay with just a wordmark - it doesn't need to be a pictoral/abstract mark.
A distinctive but easy-to-read font is important. We don't want to seperate the "z" from the rest of the word.
A "crystal ball" or "seeing eye" does symbolize seeing the future (prediction), but they are already really over-done, so if you include one, it should be really, really unique.
More info about the concepts of what we do:
http://en.wikipedia.org/wiki/Predictive_analyticsWe use it in a business intelligence market.
Mathematical or business/analysis themes are interesting.