JuliaBloggers and the searchable package listing were recently introduced.
The first ever JuliaCon was held in Chicago in June, 2014. Several session recordings are available, and the others will be released soon:
The Julia community participated in Google Summer of Code 2014. Wrap-up blog posts will be coming soon from the participants:
"The colors of chemistry" notebook by Jiahao Chen demonstrating IJulia, Gadfly, dimensional computation with SIUnits, and more.
JuliaStats - statistical and machine learning community.
JuliaOpt - optimization community.
IJulia - notebook interface built on IPython.
Images - image processing and i/o library.
Gadfly - Grammar of Graphics-inspired statistical plotting.
Winston - 2D plotting.