Yeah, I'll comment.
I'm lucky to have all of the current gen consoles with subs to Lovefilm, sky and sky movies.
The PSN video offering looks better on the surface, but in practice it's not that good!
LoveFilm is the best - although the video experience can be stuttery (I have a good 8MB ADSL) and the content is not that wide yet (they promise better). It's easy to navigate - I quite like it.
iPlayer is hard to navigate with the playstation controllers or remote - it uses the PS3 web browser (and that's nearly unusable). iPlayer on the Wii is actually preferable! It's easy to click on buttons with the Wiimote, you don't have to keep tabbing through buttons on each page (grr).
ITV and 4OD don't work properly at all. The ITV service looks like someone's holiday project with what seems to be about 5 programmes to stream (OK if you like corrie), and 4OD doesn't seem to want to actually play anything at all.
Contrast that to the 360. The look and feel of the Sky Player is the same as the rest of the xbox experience. There is plenty of content and I have never had any glitches. I'm a Movies subscriber so I get plenty of movies to play on demand (both new and old). I like it a lot.. And the kids like streaming nick jr.
On 360 I can get my videos, music and movies streamed from my Windows Media Center server with no fuss or hassle and codec support is a non-issue. Not so on the PS3.
On the PS3 you're unlikely to get demos of the latest games whereas on the 360 you're unlikely not to.
PS3 seems to want to update itself every time I turn it on and thanks to the Sony servers that takes aaaaages..
And when actually playing online games the difference shows. COD bombed out of games a lot more on the PS3 than the xbox.
I'm not having a complete downer on PS3 - cross platform games seem to (mostly) run about the same on both these days and the PS3 has some nice exclusives. Blu-ray is also a big bonus. But for their online offerings you have to give it to the xbox by a very significant margin.