I released Yacpi-1.1 (
http://www.ngolde.de/yacpi.html).
Here is the small changelog: 
 cleanup of some code
  added display of help and version number 
 new feature: it is possible to collect the remaining time over some
   samples to get a more accurate value
  yacpi shows time for recharging the batteries
It is nice to see how many people are interrested in this program.
Me and Michael Prokop finished the work on the acpi-screen and it will be included in the
screen status line of 
http://www.grml.orgI will put it on a website in the next weeks.