auto-post embedded youtube videos into Wordpress based on tags

I need a script that will pull tags from youtube and embedd videos into my word-press blogs at a set interval (auto posting something new every 3 hours say). this will probably need to be built on youtube's rss feeds maybe? visit a couple blogs that are doing this now for inspiration: [login to view URL] [login to view URL] I know it's possible as these two sites are doing it now but I'd rather have my own system as opposed to paying someone else to provide the feed to my blog (I don't know how long they'll be around etc) Thanks for bidding and please let me know what this project will take. -Jonathan