SAP delivers the new SAPGUI 7.10 - and it is really stable !
SAP now delivers the "long term supported" SAPGUI 7.10. As 6.40 runs out of maintenance in 12/2006, it might be useful for you to update to this level.
For a complete CD click here:
SAPGUI 7.10 Complete CD Downlaod
For Patches you should look here:
SAPGUI 7.10 Patches