I attended YAPC:NA 2015 in Salt Lake City, UT from June 8-10. This was my second YAPC and was every bit as enjoyable as the first. It was also in a great spot for me to add a bit of vacation to the conference and visit some family.
If you do nothing else watch this, it was by far the most memorable event this year. It's too bad the audio was not right on the "official" video because that was one great performance.
These were my favorite presentations I attended. I learned something from them all and found new tools and projects I will be using in my work going forward. I included the slides and video if I could find them.
There are presentations I did not attend, but the topic is interesting and I have or will watch:
Writing XS in plain C
I forgot to mention a couple items I want to investigate further and/or try out.
DreamCatcher - a DNS monitoring suite
Log::ProgramInfo - interesting logging module
Heka - "in-flight" data collection and collation tool