I recently came across a blog post on 911-need-code-help which explains how to insert (embed) multiple YouTube Videos into your blog posts. You can find both a demo and code to use, by visiting link above.
If you use Blogger, you can paste the JavaScript code directly into the post, so you won't increase the pageload for all of your blog's pages. But use draft.blogger.com as the normal Blogger doesn't publish JavaScript code correctly.
Alternatively, you could use Embedr to embed multiple videos into your blog posts which works with other websites too (not just YouTube).
If you use Blogger, you can paste the JavaScript code directly into the post, so you won't increase the pageload for all of your blog's pages. But use draft.blogger.com as the normal Blogger doesn't publish JavaScript code correctly.
Alternatively, you could use Embedr to embed multiple videos into your blog posts which works with other websites too (not just YouTube).