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Can anyone with my upload speed (In layman's terms; Or just dumbed down).  I've tried cablenut, but it didn't seem to help me too much (Maybe I was using it wrong; Maybe you have another tool that is more user friendly you could recommend).  I usually use Firefox as my browser.  I've run the tweak thing that Bellsouth has (at the end of the speed test ), and it says I need to change my RWIN from 78408 to 69696.  When I do this (After I reboot my computer), it will tell me to change it back to 78408 (After another speed test).  Posted below are some other things that may help a nice person willing to give advice:  I really would appreciate it.
MTU is set to 1400
MSS is set to 1360 (Both of these are according to Bellsouth; I wouldn't have a clue how to change them; So if I need to, please tell me how to)
My processor is Pentium 4 2.53 GHz
1GB of Ram
80 GB Hard Drive
My test from testmy.net are as follows
 ::::::::::.. Download Stats ..::::::::::
Connection is:: 1402 Kbps about 1.4 Mbps (tested with 1013 kB)
Download Speed is:: 171 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sat Feb 25 2006 12:57:03 GMT-0500 (Eastern Standard Time)
Bottom Line:: 25X faster than 56K 1MB download in 5.99 sec
Diagnosis: May need help : running at only 55.35 % of your hosts average (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-2MG487YBC
::::::::::.. Upload Stats ..::::::::::
Connection is:: 329 Kbps about 0.3 Mbps (tested with 579 kB)
Upload Speed is:: 40 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sat Feb 25 2006 13:10:47 GMT-0500 (Eastern Standard Time)
Bottom Line:: 6X faster than 56K 1MB upload in 25.6 sec
Diagnosis: Awesome! 20% + : 43.67 % faster than the average for host (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-SVTQAELPC

Thanks for your help.  Just a few quick questions.  Do I need to check the PPPoe button?  Does it matter that I have a router D-Link 802.11 / 2.4 GHz?  I only use it now and again to connect from a laptop in another room. Also, after I downoaded the TCP Optimizer, I noticed under a tab Largest MTU it had a packet to download (Says find the largest possible non-fragmented packet; Do you suggest do this?).

Huh-I was really hoping that would do it.  However, my download speed seems to be about the same.  Should I change them back since it didn't seem to help, or should I try something else?  I really appreciate the advise.
::::::::::.. Download Stats ..::::::::::
Connection is:: 1417 Kbps about 1.4 Mbps (tested with 1013 kB)
Download Speed is:: 173 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sat Feb 25 2006 14:38:00 GMT-0500 (Eastern Standard Time)
Bottom Line:: 25X faster than 56K 1MB download in 5.92 sec
Diagnosis: May need help : running at only 55.92 % of your hosts average (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-0XU9JWZB1

::::::::::.. Upload Stats ..::::::::::
Connection is:: 301 Kbps about 0.3 Mbps (tested with 579 kB)
Upload Speed is:: 37 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sat Feb 25 2006 14:40:27 GMT-0500 (Eastern Standard Time)
Bottom Line:: 5X faster than 56K 1MB upload in 27.68 sec
Diagnosis: Awesome! 20% + : 31.44 % faster than the average for host (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-87ZG4DQ2A

Thanks RJ44 -I appreciate the advise.  However, it didn't seem to help increase the download speed.  I was really rooting for to.  Oh well, any more advise will be appreciated.  I've tried Bellsouth tech support, and they say that my speed is fine (Even though when I had Ultra, my upload was 1.2.  With Extreme 3.0 it's only 1.5 {But thanks to your advise and dlewis23, I increased it some}). 
::::::::::.. Download Stats ..::::::::::
Connection is:: 1452 Kbps about 1.5 Mbps (tested with 1013 kB)
Download Speed is:: 177 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sun Feb 26 2006 00:11:44 GMT-0500 (Eastern Standard Time)
Bottom Line:: 26X faster than 56K 1MB download in 5.79 sec
Diagnosis: May need help : running at only 57.3 % of your hosts average (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-KPBJ3XVAE

::::::::::.. Upload Stats ..::::::::::
Connection is:: 334 Kbps about 0.3 Mbps (tested with 579 kB)
Upload Speed is:: 41 kB/s
Tested From:: http://testmy.net  (server1)
Test Time:: Sun Feb 26 2006 00:14:09 GMT-0500 (Eastern Standard Time)
Bottom Line:: 6X faster than 56K 1MB upload in 24.98 sec
Diagnosis: Awesome! 20% + : 45.85 % faster than the average for host (bellsouth.net)
Validation Link:: http://testmy.net/stats/id-X2INFQWCT

There is nothing wrong with the model of modem you have, the 2200 will support Xtreme just fine.  It's possible that your particular modem could be bad, or you may have some kind of trouble on your line keeping you from reaching 3.0 though.  Check this link out:  http://www.dslreports.com/faq/bellsouth/9.0+Troubleshooting#4787

If you can pull your line stats from the NID, and post them here, it will tell us if there is some type of physical problem or if something else is causing your slow speeds.  Oh, one more thought.  Have you tested your speeds at speed.fastaccess.com?  If so are they the same there?