I love your Beatles & Radiohead stance. Personally, I respect and can understand how and why The Beatles manage to achieve such a massive play count, even among young kids; Radiohead's another matter though, and their popularity defeats me, (don't get me started about The Red Hot Chili Peppers), but I guess I simply have to accept it.
One of the killer features of LastFM (which you obviously embrace) is that it enables anyone sufficiently inquisitive to easily encounter a great diversity of music that would be difficult or impossible otherwise. Maybe I'm too critical, but I find it odd that more people don't use this incredibly valuable resource to widen their musical horizon. Certainly it has helped me to appreciate artists worldwide, and not necessarily 'NEW' ones. I don't have a problem looking back to the past as well as to the future.
I tend to listen to local radio at work at low volume and find the musical selection, adverts and inane monotonous verbal diahorrea increasingly frustrating. I'd like to think that LastFM's concept could potentially be the future of radio.
I agree wholeheartedly with your comment about periodically needing a change. I go through phases of listening to soul, Motown, Disco, Northern Soul, reggae, classic rock, 60s, 70s, 80s, 90s, instrumental, new wave, etc. I recall you've already picked up on my personal tags - they're coming along nicely still. Given time, I may even start to expand some more 'quirky' tags to spice things up a bit.