Om nom nom, Narnia crossovers! You've got several here I haven't seen before, and they're lovely.
I can add a few to your list!
The Made Up Things (http://fanfic.mirkat.net/viewstory.php?sid=6) [Harry Potter]: In which Lily and Petunia's mother is Susan. A sympathetic Petunia, too!
Threads That Are Golden Don't Break Easily (http://paperclipbitch.livejournal.com/99563.html) [Torchwood]: In which Susan (eventually) joins Torchwood. I know you're not into Torchwood, but this is one of the best Narnia crossovers I've seen, and one of the best answers to the Problem of Susan too.
Bredon in Narnia (http://antisoppist.livejournal.com/90754.html) [Lord Peter Wimsey]: In which Lord Peter Wimsey's son goes to Narnia and meets the White Witch and is distinctly unimpressed. (I don't know how well this one works without knowing the source text, but I think it's great)
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I can add a few to your list!
The Made Up Things (http://fanfic.mirkat.net/viewstory.php?sid=6) [Harry Potter]: In which Lily and Petunia's mother is Susan. A sympathetic Petunia, too!
Threads That Are Golden Don't Break Easily (http://paperclipbitch.livejournal.com/99563.html) [Torchwood]: In which Susan (eventually) joins Torchwood. I know you're not into Torchwood, but this is one of the best Narnia crossovers I've seen, and one of the best answers to the Problem of Susan too.
Bredon in Narnia (http://antisoppist.livejournal.com/90754.html) [Lord Peter Wimsey]: In which Lord Peter Wimsey's son goes to Narnia and meets the White Witch and is distinctly unimpressed. (I don't know how well this one works without knowing the source text, but I think it's great)