I’ve put together a quick little site for you to play with.
Head on over to cryptohash.net and have a play with sha1, md5, and all their cryptic friends.

A usage meter for Virgin Broadband

Calculate the theoretical speed of your ADSL link based on the line attenuation.

Del.icio.us bookmarklet that works with the del.icio.us API to allow you to bookmark across browsers with ease.

A simple tool that pings a host on the internet to keep your connection alive.