Paranoid?

For the paranoid users reading, refer to this. The onion router network is an excellent way to scrub your source ip when you're just surfing or logging into a friend's server. Read the documentation here to install. Then either use the proxy settings in PuTTy and make sure to use SOCKS4 and keepalives to keep it alive, or if you're doing it from command line use socat to create a bidirectional connection with the destination. Example:

socat TCP4-LISTEN:4242,fork SOCKS4A:10.0.0.1:www.fbi.gov:22,socksport=9050
ssh -p 4242 federale@localhost

The connection/latency isn't always the greatest but at least you've covered your tracks.

[federale@fbi:~] last -10 federale
federale ttypd ned.snow-crash Sun Mar 26 15:05 still logged in
federale ttypg ned.snow-crash Sun Mar 26 15:01 - 15:04 (00:03)
federale ttypd slab.caida Sun Mar 26 14:50 - 15:02 (00:12)
federale ttypd 137.148.5.13 Sun Mar 26 10:19 - 12:25 (02:05)
federale ttypb 137.148.5.13 Sun Mar 26 10:18 - 12:19 (02:01)
federale ttype 85.31.186.61 Sun Mar 26 00:08 - 02:13 (02:04)