Here is the brief section on the homebrew scene, minus the formatting and links, because copy and paste doesn't like formatting and I can't be arsed to fix it.
Homebrew
The PC Engine homebrew used to be pretty low-key, but has seen a resurgence as of late. There are currently 6 titles that have been released commercially, a couple others in ROM format, and a few tech demos. There are another 6-9 titles currently under development across the various developers active in the scene. Here are the ones released commercially. So far only CD titles have been released, but Aetherbyte has a cart title in the works on a homemade cartridge.
MindRec: A legit company that does PC Engine development on the side, if only because BT Garner of TurboList fame is the man in charge. They were the first on the commercial homebrew scene for the PC Engine and have been dormant for some time, but with the reprint of Meteor Blaster DX, there are indications that change is a comin'.
Implode: Colored block puzzler. Included on the CD are Crash and Humpball. CDR release.
Meteor Blaster DX: Souped up Asteroids clone. Recently reprinted on proper pressed CDs (no more CDRs). Includes a Caravan mode and the puzzle game Loop as bonuses.
Aetherbyte: A veteran programmer and a hot-headed newcomer have together created what seems to be a classic arcade revival on the TurboGrafx 16. One of their hallmarks is insisting on using PSG soundtracks despite making CD games. Once you hear their PSG work, however, you'll agree that this isn't necessarily a bad thing.
Insanity: Colorful Berzerk clone with a dark, droning, retro-techno soundtrack. Has an Xbox360 release as well.
Pyramid Plunder: Pac-Man clone that mixes things up with powerups and multi-screen levels.
Frozen Utopia: Several creative individuals from the PC Engine community who are, together, a powerful force for gaming.
Mysterious Song: A port of a Windows RPG with redone content. Has cut scenes and voice acting as well as a suitable CD soundtrack. It is a little on the short side but it hews closely to classic RPG sensibilities. You'll feel just like it's 1990!
Touko: A mysterious Frenchman with amazing PC Engine powers. He only has one complete commercial title so far, but it won't be his last. Like Aytherbyte, he's sticking closely to the arcade classics that the PC Engine and Turbo Grafx 16 missed out on.
Revival Chase: A remake of the classic arcade game Lock n' Chase. Exclusively available with the classic games magazine, Revival, which, fortunately, has a US version. The French issue is number 50, but the US issue is 45. Here is a link to help you procure this one. Includes a hidden shooter.
There's also some great homebrew hardware available, for those who want to play homebrew ROMs, translated ROMs, and ROM hacks:
Low Cost Flash HuCard: Handmade flash card that is simple and affordable. It is a 1 MiB (8 Mib) flash device with a USB interface and software that allows you to switch regions and even eliminate the US region check code. Does not support any games larger than 8 Mib (Street Fighter II' was the only commercial title that meets this criteria).
Turbo Everdrive: Krizz is well-known for his flash-cards. This new entry to the Everdrive family can store multiple games on SD cards and even supports the Street Fighter II' mapper. Features a bootable menu to select your game and a reset button on the cart for when you want to switch.