We got a preview of Seidio's Innocase Snap, a case designed for use with the company's 3500mAh extended battery, while it was still under development last month, and now it's in final form and shipping for $29.95.
The new case is now called the Innocase Extended, though Innocase Snap is still shown in the browser title bar.
Either way, the design of the soft-touch plastic case hasn't been dramatically changed since the last time we saw it. It still looks better than the replacement back cover that ships with the battery, though, and it at least offers a bit of protection for the EVO.
The battery bulge is much more obvious on the Innocase Extended than it is with Mugen Power's newly unveiled 3200mAh extended battery replacement cover, but if runtime is more important to you than aesthetics and the stated capacities are accurate, then Seidio's option may be worth considering.