When browsing to a site that has an active PayPal donate button with IE 7 a box comes up saying that you could be visiting a Phising site, I have tracked this down to the PayPal button on an http page .... put it on a https page the warning does not appear.
I contacted Microsoft in Reading (UK local office) and spoke to someone and they confirmed my findings.
Not sure how easy it will be to implement a Geeklog site as secure as my knowledge how to do this under PHP is zero.
- William -