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Unfortunately, it doesn't explain to the newcomer why this language is worth learning. I was expecting some kind of feature comparison or "Why another language?" article. (That's a first impression. Then I read the comments here, and discovered it's based on PLT Scheme, which at least tell s me a little about what to expect.)
It's not just based on PLT Scheme, it is PLT Scheme, rebranded.
What I don't like about Racket (former PLT Scheme) is that it's a closed environment. You can't use common Scheme libraries (for instance: SLIB), debugging facilities are hidden into Racket's editor therefore you can't access them from Emacs or other tools, etc.
SLIB has worked in the past. If there are specific parts of SLIB you need, try asking the mailing list for help.
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I don't think I would call scheme "web-oriented".
It may not be common to refer to it as such, but the PLT Scheme guys see the web as the killer app for Scheme's continuations: http://www.cs.brown.edu/~sk/Publications/Papers/Published/kh... http://en.wikipedia.org/wiki/Continuation#Continuations_in_W...