My new PC is up and running and starting to be "just right" (we'll get to further details later, I promise), so one of the big "new" things I've got for the new year is a subscription to Adobe CC - specifically the "Photographer" plan. I have previously mentioned worries regarding this plan; the insecurities of relying so much on software that you never truly own, but only "rent" for a given period. Ultimately though, I caved. Adobe still produces the best image editing software in the world, as far as I'm concerned, and although it's been many years since I last truly used Lightroom I remain impressed by its suite of features.
That said, referring to myself as "rusty" is probably so overly-polite it's borderline fictional when it comes to using both Lightroom and Photoshop. Not only have I taken a several-year absence, I haven't had an "up-to-date" version of either program since CS3, so there are a lot of new features and "enhanced" (read: totally different) navigation options. As a result, I'm regarding myself as a total beginner and slowly compiling an Adobe 101. I'm also continuing my war against the easily forgotten, losable "bookmark", so I figured I would just keep a rolling list going on here. With that said, here's some links to tips/advice I've found useful so far:
7 Steps to Getting Organised in Lightroom ~ Layers Magazine
Understanding the Histogram (Basics) ~ Lynda.com
JPEG Export Comparisons ~ Jeffrey Friedl
Virtual Copies ~ Laura Shoe
Focus Stacking ~ Phlearn
Noise Reduction ~ Daniel Laan (seriously awesome and includes other, non-LR tools for comparison)
Custom Metadata for Importing Photos ~ Digital Photography School
Local Adjustment Brush Settings ~ MCPactions
Colour Balancing Tips ~ Adobe Tutorials
Lightroom -> Photoshop -> Lightroom ~ Adobe Tutorials
10 Ways to Speed Up Lightroom ~ Lightroom Zen
And of course Adobe's own tutorials page, which is really very impressive in both scope and detail: Official Lightroom Details (especially combined with their Coffee Break Tips series)
I've decided to add a couple of links for straight-up photography as well:
Depth of Field Quick Guide ~ Aperture Tours
Composition Study ~ compositionstudy.com
UK Image Copyright Laws ~ gov.uk
Photo metadata/IPTC explained ~ IPTC
Astrophotography Tutorials & Tips ~ sympathink