Two very different but very good Boone/Daniel fics:
- Thick Smoke Rising by toestastegood
- The Fool Who Follows Him by elise_509
And a delightfully porny Jack/Boone with a side of voyeur!Sawyer! :
- Watching and Waiting by haldoor NC-17
ETA: With or Without You (I can't live) by holycitygirl (Jack/Sawyer with some ghost!Boone)
HERE is the complete list.