g624gtu3wx5z6oof.onion

Random interesting .onion addresses I've collected:

http://eqt5g4fuenphqinx.onion/
core.onion
freenode IRC network hidden service. more on . I haven't ever gotten SSL-over-HS to work with this one.
http://67p4weg7hoowpvc3.onion/
"a custom 3+4 layer protocol for mesh networks"
http://3g2upl4pq6kufc4m.onion/
DuckDuckGo search engine's hidden service
http://torlinkbgs6aabns.onion/
Sort-of alternative to The Hidden Wiki, moderated by one admin (Haico)
http://duskgytldkxiuqc6.onion/
Tor's example hidden service.