I'm half-heartedly looking at one of the LZO algorithms. See the `TODO' file in the main e2compr distribution.
Bzip is unsuitable for the current implementation of e2compr. (At least, version 1 of bzip was; I haven't looked at version 2 yet. The information in this paragraph pertains to bzip version 1.) Bzip clusters are 100kB--900kB each, while e2compr clusters are currently limited to 32KB each. I suppose it might be worth trying bzip with 32KB clusters, but I imagine that the results wouldn't be very different from gzip.
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