PixInsight is a powerful image processing package that I've been using lately for my astro images. There is a lot of tutorial and other helpful PixInsight material on the PixInsight site and elsewhere on the web, but it's sometimes hard to locate specific items.
This page of useful PixInsight links is organized by broad topic. I hope you find it useful.
PixInsight Official Website Material
PixInsight Resources - A new and comprehensive collection of PixInsight tutorials, examples, and documentation
PixInsight Software Tutorials - PixInsight tutorials authored by PTeam members and expert users.
PixInsight Processing Examples - PixInsight processing examples authored by PTeam members and expert users.
PixInsight Reference Documentation - Detailed PixInsight documentation for many PixInsight Processes
PixInsight Videos - This Video Tutorial Site will direct you to many great videos from Harry Page, both Intro and Advanced
PixInsight Video Tutorials - Medium and Advanced Tutorials in German and English from Gerald Wechselberger
Screen Transfer Function and Preview Windows Tutorials - from Craig Stark at Stark Labs
A New User's Experience - PixInsight Workflow from Dogwood Ridge Observatory
Processing Examples - A Varied List of Processing Examples from PixInsight Guru Alejandro Tombolini
PixInsight Tutorials - A Detailed Set of PixInsight Tutorials from Kayron Mercieca
Complete Image Processing Tutorials
NGC 1808 LRGB Processing Example - Two comprehensive PixInsight Video Tutorials by Vicent Peris, including raw image data
Image Process Demo Sword of Orion - Video tutorial from Harry Page
M106 LRGB Processing Part 1 - Video tutorial from Harry Page
M106 LRGB Processing Part 2 - Video tutorial from Harry Page
M51 Image Process Demo - Video tutorial from Harry Page
DSLR Workflow - Wide Field Orion - A detailed DSLR tutorial from Kayron Mercieca at Light Vortex Astronomy.
HDR LRGB Workflow - The tutorial goes through an entire LRGB workflow including making a HDR composite starting from the raw calibrated monochrome images to the end result with absolutely everything in-between. There are 95 screenshots in total so everything is extensively documented.
IP4AP Tutorial Series - Warren Keller and RBA have teamed up for an extensive series of PI tutorials. Online and DVD. Not free, but well worth it.
M42 PixInsight Tutorial - Tutorial from David Ault
DSLR Raw Workflow - A detailed list of notes and forum links for processing DSLR data
DSLR Workflow Tutorial - A detailed and complete workflow processing DSLR data from Kayron Mercieca
Deconvolution - Another of Juan's great little tutorials, on the PI Forum
M81-82 Deconvolution - M81 and 82 Deconvolution and Noise Reduction by Juan Conejero
Deconvolution Tutorial - A 10 minute video tutorial from Mike Wiles
Deconvolution Tutorial - A detailed tutorial from Manuel Jimenez
M27 Deconvolution Example - Good deconvolution example from Alejandro Tombolini
Mosaic Construction with Star Alignment - YouTube video from PixInsight
Mosaic Construction - Useful forum thread, with a link to the Mosaic Video Tutorials on the PI Site
Mosaic Construction - Yet another helpful video from the famous Harry Page
Gradient Merge Mosaic Tool - PI Forum discussion of Georg's great new tool
Gradient Domain - Another PI forum discussion, led by Georg Viehoever, developer of the tool
2 Frame Mosaic of the M31 Region - Shorter YouTube video from PixInsight
Sky and Telescope July 2011 - Article on Mosaic Construction by RBA - you must be a subscriber to access
Rho Ophiuchus Mosaic - Mosaic discussion in the Ice in Space forum
PixInsight Mosaics - Detailed Mosaic Tutorial from David Ault
flikr PixInsight Group - Over 400 processed PI Images