"I trust Renderosity. I trust the people who upload freebies." Agree with that, for the most part. But, if 'rosity has 15,000 active members, and only a tenth of a percent are "less than honorable," that's still 15 people. I'd never download an executable file unless I knew: 1) the person was trustworthy (let's say they've posted other freebies, they're active in the forums, etc.) and 2) they take reasonable care to prevent viruses themselves (most malicious files are spread through carelessness.)