Uploadscript.com is a PHP file upload script with ajax and flash that you can host on your own
Upload Script is the most powerful solution for developing your own file hosting site. It supports purchases, subscriptions and groups. Its the most widely used upload script there is with modules for ajax flash php and more
Uploadscript.com has a three-month global Alexa traffic rank of 413,766, and while we estimate that 29% of visitors to the site come from the US, where it is ranked #148,619, it is also popular in the UK, where it is ranked #120,660. The site is relatively popular among users in the city of Springfield-Holyoke (where it is ranked #1,163). Compared with all internet users, it appeals more to men; its visitors also tend to consist of less highly educated, less affluent users under the age of 35 who browse from home. Uploadscript.com has a bounce rate of roughly 23% (i.e., 23% of visits consist of only one pageview).