User:4 Wikipedia advertising

I've chosen 4 Wikipedia advertising to try and promote an idea to allow advertising on Wikipedia to help with the purchase of hardware. Here's my idea:

Merits

 * Its unobtrusive
 * Would provide income for much needed investment in the project.
 * (I assume) it gives advertiser no control over policy etc.

Note
Dell chosen at random and advert generated myself to illustrate the idea.

Any comments are very welcome as are any pointers as to where this debate is (or should be) happening.