I think I've figured this out now. I made video podcasts using typepad and then my feeds are managed with feedburner. The feeds were always fine and I could download the video attachments from the feed in a browser or from feedburner just fine. But, iTunes kept giving me an unknown error 505 when I downloaded. This has turned out to be the spaces in the file name. iTunes doesn't URL encode the links to the media. If I url encode the file name in the link to the media in the blog post then iTunes works fine. So, if your file is "http:ssssssss/WXS 3.m4p" then change it to "http:ssssss/WXS%203.m4p" and then it's fine.
I also have intermittent problems with podcast episodes failing to download at varying points. This looks like a typepad problem but they won't acknowledge it. I'm now uploading my video m4ps to Amazon S3 and then linking the file on S3 instead of typepad and this solves the problem totally.
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