G&W Gallery 4 is the bomb, fantastic cart, just haven't got around to picking it up again is all. Other than the original G&WG I think they all have an expansion list of games to unlock when you crack enough stars on the high score screen. I had so much fun unlocking all those gem titles hiding in there.
I was happily wrong about the local ma & pa store half price hosed up on home console games, they apparently don't do well with Gameboy. The first one I blew $9 along with just a few bucks in trade and got Revenge of the Gator, G&W Gallery 1, Kirby's Pinball Land, and a mismarked .99 copy of Tetris Attack. The other location was 3 for $10 and ended up with Mole Mania and then GBC releases of Aladdin and Lemmings. I was hunting Super Mario Land mainly, no dice.

DS: GB World. I was close friends online with Martin of nesworld.com and ended up working with him originally taking over all the publishing and some development of music for the NES World Jukebox. I was huge on GB then with the N64 floundering and with him set up a companion site GB World which had news, stories, and GB/GBC game reviews and it ran for around 2 years. It wasn't huge, but I had a good steady base of readers and on occasion got a few people who would submit reviews to the site too.