View Inside Zip and Rar Files with Google Docs
Google Docs supports viewing the contents of Rar and Zip files online. Apart from viewing, it also allows to download the files inside the archives.
Using it is easy. Just go to https://docs.google.com/viewer and give the link to the archive file to view.
If the file is in your computer, or cell phone, just attach and send it as an email to Gmail. Gmail uses Google Docs Viewer internally to display attached files.
Another alternative is Wobzip, which can extract zip and rar files online.