Webinars on using different databases have proved to be very helpful-plus they are free! (Scifinder webinars)
Mostly the resources listed above, along with conversations with colleagues.
I used to use Google Reader to aggregate my news, but now I use Feedly (Reader is now defunct). I have a few topics that I like to keep up to date on, which includes blog feeds and general news searches on information literacy and library movement, in addition to world news.
Co-workers
I like to look at award winning academic library websites. Library databases in researching topics of professional interest. Read through conference agendas.
Chronicle of Higher Education