JAB_Creations - 4:33 pm on Feb 26, 2010 (gmt 0)
I've always made an effort to minimize broadband content on the dial-up user's option on my site. 377KB for broadband and 66KB for dial-up on the same page on my blog in example.
A nice on-topic Firefox extension: lori (Life-of-request info). I'll let a mode post a link to Mozilla's extensions (or edit this post) though at the bottom-right in Firefox's status bar is shows the total bandwidth of each page load. For example when I last loaded this page it was 18KB which is roughly four seconds on a solid 36K connection.