On the bottom of the stand I have an Isotek mini-sub and a Pioneer 868 DVD player. On the glass stand I have a sky+ box and a KEF egg. This was the best arrangement for me but I did briefly have all the components on the glass stand at one time with no problems. The stand comes with 2 sting eyletes that can be attached to the plasma and then the wall for extra support but i havent bothered with this.
It says in the instructions that the maximum load on the glass stand is 20kg.