How safe are those "Free" Anonymous SSL,HTTPS Proxies?

["Jon S." <supercool9000 () hotmail com>]

How safe is it for someone to use one of those Anonymous SSL, HTTP proxy 
servers
that can be found from the internet (after searching for "free proxy 
servers")?

1) Is it just plain stupid to use the "free" Anonymous proxy servers that we 
found from the net,
when we're thinking of securing the communication via "SSL, HTTPS"?

Or would you say "it's still better than revealing your source IP
and jeapordizing your anonymity, use it if you can".

2) Is any part of "Anonymous SSL,HTTPS Proxy" ever sent unencrypted (or 
otherwise abnormally vulnerable form), aside from header packets?

3) How difficult is it for someone to intercept AND decipher the messages, 
(in terms of average time assuming typical ssl/https encryption strength)?

Thanks in advance...

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