Throttled is a good open source (free) piece of software that gives you the option of throttling your total speed, or just upload or download speeds for different applications. It can be found at http://download.cnet.com/throttled/3000-2651_4-49719.html

If you're abit more adventerous you can set up your own throttles using the terminal, this can be simplier in the long run and means you don't have to run extra software, see http://www.mactricksandtips.com/2008/12/throttling-bandwidth-on-a-mac.html
Source(s):
http://download.cnet.com/throttled/3000-2651_4-49719.html
http://www.mactricksandtips.com/2008/12/throttling-bandwidth-on-a-mac.html

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I suggest you use Darwin for bandwidth throttling app for mac OS X.

-quote-

"by: jaguarcy
Advanced OS X users know that Darwin comes with ipfw, which can be used to set up a custom firewall. This same service however can be used to also limit bandwidth on specific ports.

Example: Â Â Â

sudo ipfw pipe 1 config bw 15KByte/s

creates a pipe that only allows up to 15KB/s to go through.

Then: Â Â Â

sudo ipfw add 1 pipe 1 src-port 80

will attach that pipe to the outgoing traffic on port 80, effectively limiting the outgoing traffic of the web server. Â Â Â

sudo ipfw delete 1

will remove the pipe from the port.

adds: I haven't tested this. Just make sure you remember to turn this off when you no longer need it! "

-end of quote-
Source(s):
http://www.macosxhints.com/article.php?story=20080119112509736

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