Contact
G-wrap has a mailing list. Please send us your questions, patches and/or requests for improvements there. You may subscribe, unsubscribe and read the archives here.
Bugs
G-Wrap has a bug tracker. You may submit bug reports using the bug tracker or, if it's easier for you, using the mailing list.
Irc
You can sometimes find some of the hackers hanging out on #guile on irc.freenode.net.