I've not heard much about Ispeed, but I've heard of some others. If I'm not mistaken there are some free ones out there as well. I believe they use compression, but I would suggest putting this in the Networking thread. Someone there might have a really good idea of how beneficial that software is. I personally don't agree with it. I think if you use certain sites a lot, let your browser caching do its thing and just deal with the over-graphisized (if that's a word) internet.