How to add PING in WPMU ?
How to add PING in WPMU ? How to Enable Site Ping for WPMU ?
NOTE: for experienced users only. if shits happen, at least you will know what to do. UPX is a nice small tool to compress executables into smaller size. this makes them load faster. with the most common hardware today (i.e. fast CPU and abundant RAM), this is a good thing to do.