Uploading your project from iMovie 09 to YouTube is simple! All you need is your completed project and a YouTube account to get started (sign on to youtube.com and get your free account).
Before you start your exporting and uploading, it’s important to note that YouTube allows videos that are up to 2GB in size and 10 minutes in length. Here is the help article from YouTube.com – http://bit.ly/crM5K5
Step 1: Navigate to the share menu and select the YouTube option.
Note: This will open up a dialogue box that will prompt you to select your YouTube user name.
Step 2: Fill in the blank fields in the “Publish your project to YouTube” dialogue box. You have the option of creating mobile and medium sized movies, which will change the file size of your exported video. For this example, the project will be exported as a movie that is 640 pixels wide by 360 pixels tall (If you have a long video, you might consider exporting and uploading your project as a mobile sized video).
Step 3: After you have filled in all of the fields, click the next button to start exporting and uploading to YouTube. After you click next, a dialogue box will open requiring you to acknowledge that your project complies with all copyright laws.
Step 4: Click the “publish” button and iMovie will begin the export and upload process. The duration of this process will depend on the length of your project as well as the quality of the footage that you have imported into your project.
Once your project is done uploading, iMovie will display a confirmation dialogue that will provide the url to your project on YouTube.com.
After this step, YouTube’s software will work on further converting your file to optimize it for viewing on the web. You’re all done!
Follow this link to view a Knowledge Base tutorial on embeding a YouTube video on a blogs.miis blog: http://sites.miis.edu/kb/2009/10/19/how-do-i-embed-a-video-in-a-blog-post/