Link to the pipe: pipes.yahoo.com/mspotilas/youtubeactivityfeed.
And here's the "badge output" of that pipe from my youtube feed page, with 5 items:
You may also use the "Get as a Badge" link when the pipe is run in the pipe's page, it offers an automated gadget installation into Blogger blogs, WordPress blogs and others.
Update May 21th: Because Badge output does not work with Opera browser, you might consider using instead a gadget made by me, which works with Opera.
Parameters of the pipe:
user: youtube user name,
max-results: maximum number of items returned,
allow: only accept entries that have this word in description, for example "liked" to get only likes or "uploaded" to get only uploads,
disallow: don't allow entries that have this word in description, for example "commented" to filter out commenting activity.
So at minimum you just have to change the user parameter value from "mspotilas" to any youtube user name you want (it does not have to be yours, try for example "NBC"). In my YABTB demo blog, to show what can be done with CSS styles, I also changed background colors, adjusted font sizes and margins, changed thumbnail to right side, changed thumbnail proportions (size), and hid the footer (powered by and get this), like this:
There is also a YouTube RSS feed, but... YouTube gdata feed for YouTube channel includes only uploads. No likes, favourites, comments, etc. Link to YouTube user's RSS feed of uploads is:
For example my YouTube channel's RSS feed is:
This is my very first Yahoo Pipe, so the implementation might be a bit clumsy. But it works, at least in my tests. :) You can clone the pipe and modify it according to your needs, or use this pipe if it suits you as is. If you like it, or find some bugs or something to improve, please tell me.
Update May 20th: I found out that Opera browser is not supported by Yahoo! Pipes. :( I think I could make a gadget for the pipe which would work in Opera, too, but I'm not sure if I will. About 3 % of my blog's viewers do use Opera.
Update May 21th: Here's the gadget I made, works with Opera, too.