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Vista Stories: PeaZip Portable.
PeaZip is available in a portable edition, and is regarded as an excellent free archiver that even has its own compression format (pea), but also offers support for decompression of multiple types of archives starting with 7Z, 7-Zip sfx, ARJ, BZIP2, CAB, CHM, CPIO, DEB, GZIP, ISO, JAR, LHA, LZH, NSIS, OOo, paq, PEA, QUAD, RAR, RPM, split, TAR, Z, ZIP.