As of 2017, the flash proxy project is deprecated. but I wanted this page to continue. Now this page supports a similar project called Snowflake by torproject. Below is the widget that you can enable to donate your bandwidth and help Tor users circumvent censorship. Go to Snowflake page to know more on how it works or if you have questions.
Snowflake allows you to connect to the Tor network in places where Tor is blocked by routing your connection through volunteer proxies located in uncensored countries. Similar to VPNs, which help users bypass Internet censorship, Snowflake disguises your Internet activity as though you’re making a video or voice call, making you less detectable to Internet censors.