You want more donations, you put the donations link in more places. Yes it's easy for someone looking for it to find it- but how about the businessman whose sysadmin just said "we should look at openBSD 3.9"- he'll search for & see that 3.9 release page, and not know that his department is about to get some software that needs monetary support.
If each release page contained a blurb: "This release was made possible by private donations and businesses' monetary support. Please click here to see how you can help fund developer's work for your next release, OpenBSD 4.0" (or whatever the next release is)- it would raise awareness of OpenBSDs reliance on donations, and would bring it to the attention of some who never see the home page. Which will probably bring more money in, for not very much incremental effor.
