Here’s a screenshot of my latest lockscreen on the iPhone4.  

I’m using Typophone 4 by angelman8, which I modified to include weather.

This also works as my background for @stimpy5050 ‘s #lockinfo - you just can’t see it because I don’t have any emails or messages currently.  LOVE IT!

To edit the weather location just go into /private/var/stash/Themes.XXXXX on your iPhone and edit the location param in LockBackground.html

Easiest way to install is to install Typophone 4 from cydia and then SFTP into your iPhone and replace the contents of the Typophone 4 theme folder with this (Typophone 4 modded).

***EDIT***

I just updated the zip to include a modified version of the unlock slider and some text for the power off and answer/callback unlock slides.  The slider no longer has a solid black background but instead a drop shadow (black/red/green).  Looks much nicer!