cuteTube-QML 1.3.3 works well for me except these two issues:

The first one, is what stickymick mentioned already: Trying to open any video in DailyMotion just crashes the program, so DailyMotion is not usable.

The other issue affects YouTube, and it has also been mentioned. It doesn't always take place (it takes a few times to reproduce normally) but it always ends up happening in 1.3.3.:
- Do a search, and from the list of results, click directly on the thumbnail to start the video.
- At this point, sometimes it works, and sometimes it starts loading and then returns to the list of results. If this is the case, when the next video is played, the previous video's sound will be played over (somebody referred to that as double sound earlier). If you go back to the list of results, you will still hear the sound of the first video you tried to play and failed, even though no videos are playing. So cuteTube still has that stream open and is playing it.
- If the failure is not reproduced, go back and click another thumbnail in the results list, until a video doesn't play. Then you will be able to reproduce the issue.

When a video starts loading and doesn't play it's time to quit cuteTube and restart the program, because it is not possible to play other videos acceptably.

Originally, I ran the 1.3.3 update over 1.3.2. When this didn't work, I tried uninstalling cuteTube-QML, then installing 1.3.3 directly. This required installing first 2 packages (qt4-homescreen-loader and mcsp). This didn't work either, so I uninstalled cuteTube-QML again, uninstalled those packages, and again installed 1.3.2 from extras-testing, and attempted to update to 1.3.3. Again, it didn't work and I can reproduce this issue.

If it makes any difference, I'm running CSSU-Thumb and KP52 on one of the N900s, and the other one is just running stock PR1.3.1, although it has quite a few packages from extras-testing and extras-devel.

Thanks to marxian for a great application, it truly is one of the most useful apps on the N900 for entertainment!