Personal favourites are UK's BBC 6 Music, and a small Lisbon-based station called Oxygenio[1]
However I think it's easy to fall into a habit/routine of constantly looking for and acquiring new (to me) releases when it actually may be a good idea to take a step back, rediscover the collection you already have and go back to passively stumbling upon hidden gems rather than actively seeking them out in a Discogs dive with a few dozen open tabs.
Radio, like NTS[0] as well as the mixes of other curators/DJs have indeed been a great source of inspiration for a more relaxed approach to discovery.
Most of the comments appear to be about the best algorithmic recommendation engine. I've used them all and still think it doesn't compare to the experience of human-curated music. Even a 1 paragraph review of the record tells me more than a "You might also like [___]" message.
That said, some of the ones I like are
- SomaFM (mentioned in these replies already I think)
- KEXP (an actual broadcast station, but I listen online: https://kexp.org)
- Devil's Night Radio (this was taken down and they regrouped under the name KPJK. I only have the link to listen on TuneIn but it's essentially described as "the best dive bar jukebox" with a mix of punk, garage, oldies, rock, sad cowboy songs, and assorted weird stuff. https://tunein.com/radio/KPJK-s263142/)
I know it's not as big a thing as it was in the mid-late 2000's but there are still thousands of Shoutcast/Icecast/etc. stations and many of them are programmed by DJs, music enthusiasts, and fans. A good set of bookmarks is like having a radio dial filled with 10 or 20 college radio stations (or whatever analogue you would consider to be the ideal type of radio for your tastes.)
I've been listening to streaming radio since the early 2000's and one of the main reasons I bought my first smartphone (Palm Treo!) was because I could install a Winamp clone and listen in the car, on headphones, or wherever I was. I still do this today--albeit on a slightly nicer phone.