http://www.rarlabs.com ... its really really easy to download rar. rar's can compress files that are HUUUUUUUGE where as zip can not.
the 90GB file I zipped says that you are wrong. anything that can be rar'd can be zipped. Rars have 3 things that are benefits.
1) better compression
2) ability to be split and rejoined
3) parity for rebuilding missing files