I don't know whether you've got specific goals for this--if it's just space-compressed, there's an OSS packaged by the name of speex (www.speex.org) which gets an exceptionally good compression ratio on speech. For speech, speex gets 2-4 times the compression ratio of OGG with about the same quality (however, compressing non-speech like music comes out really dumpy sounding). If you just want to speed up playback without pitch shifting, that's another matter. The "sox" package has an option for speeding up playback without changing the pitch. You can learn more about sox on its website at SourceForge (http://sox.sourceforge.net). There's even a good section in the Linux Cookbook on using Sox: http://www.dsl.org/cookbook/cookbook_29.html#SEC404
A combination of speex (to store it and then play it back to a file) and sox (to take the output "file" piped from the "speexdec" decoder, and play it back at an altered rate) could be a handy combination.
However, if your purpose is just to have fun, keep hacking! (grins) Might even find some handy stuff in the source code of either app.
Hope this helps you in your quest for speech compression,
-tim
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