Sun Mar 18, 2012 7:45 am
You can do pretty much anything with it. In fact, many of us, before brewing a huge beer (e.g. barleywine, RIS, 1.100+ OG) will brew a average strength beer specifically to reuse the yeast from it in the big beer.
In general, it's better to repitch from lower gravities to higher, lighter to darker, and less hoppy to more hoppy. This is mostly important at the extremes, an average strength, average hopped beer can be pretty much repitched into anything.