Firefox with Flash and Java Plugins.
The above works on the Centos 6 Live CD also.
Older Hardware
Flash Player 11 was compiled to use sse2 and may not work with older Intels (P4s, P3s) and 32 bit AMD systems. To check run
$ cat /proc/cpuinfo
and look for 'sse2' in the flags line. Just 'sse' indicates you have an older unit which means you should try Flash Player 10.
Then follow the same procedure as above