I ahve been using the same site (http://www.thinkbroadband.com/)for speed tests for four yrs so that all my results are from the same test site.
Here are my results from April 25 and today and as you can see there a quite an increase.

09/05/09 01:44:49
Speed Down 1656.58 Kbps ( 1.6 Mbps )
Speed Up 229.07 Kbps ( 0.2 Mbps )
Port 8095
Server speedtest1.thinkbroadband.com
IP Address 78.101.137.48

Date 25/04/09 08:05:06
Speed Down 982.75 Kbps ( 1 Mbps )
Speed Up 127.55 Kbps ( 0.1 Mbps )
Port 8095
Server speedtest1.thinkbroadband.com
IP Address 78.101.111.78