sometimes the yellow tooltips get annoying when you already know what buttons do and in beryl when they are exploding and going bananas you may want to get rid of them.

kind of a roundabout workaround - i found it googling for a bit and modified the walkthrough for 0.2.0:

1. open beryl settings manager
2. go to window management on the top
3. go to set window attribs by various criteria on the left
4. on the “Abosolute Window Opacity” (sic) click the plus icon next to the listbox
5. select window type from the combo dropdown and type Tooltip in the textbox next to it
6. leave the slider at 0

use this until the gconf method actually works.