Yeah winrar isn't too bad..
I have been using winace for a while now..
Compression in the following formats: ACE, ZIP, LHA, MS-CAB, JAVA JAR, GZip, TAR, GZippedTar
Decompression of: ACE, ZIP, LHA, MS-CAB, RAR, ARC, ARJ, GZip, TAR, ZOO, JAR
has decent compatibility with most of the common compression types.. and it is real easy to use..