Colour Adjustment Tools
Changing the colour balance or removing a colour cast
Adjusting the colour balance for part of the image
Selective colour adjustments, adjusting specific colour ranges
Using the colour adjustment tools to create artistic colour changes
Setting areas of an image to pure black or pure white
Colour adjustments using Adjustment Layers

Selection Tools
Selection tool options, cropping to a selection – fixed aspect ratio selection
Modifying selections – transform selection tool, expand, contract, feather
Creating complex selections around image areas
Saving selections – reloading and modifying saved selections later
Using Extract to make a cut out or a mask
Making a mask from a selection

Layers
Organising layers and the content on them
Copying layers to other open documents
Using and editing layer masks
Using opacity and layer blending modes for different effects

Colours
Choosing colours from different colour models
Save colours for later use
Ensuring the your colours are printable – Proof settings and Gamut Warning

Paint Brushes & Patterns
Creating new brush shapes, save your brushes and load new brushes
Paint with different colour blending modes
Painting in straight lines
Creating a pattern and fill a selected area with a pattern

Channels
Editing individual colour channels
Creating and editing alpha masks
Using a copy of a colour channel to create an image mask or a selection
Creating greyscale images from selected colour channels

Photo Retouching
Removing scratches and restoring damaged photographs
Removing red eye from a photograph taken with flash
Removing an unwanted items from a photo
Adding objects to photographs
Changing the background of an image

Illustrator Artwork
Bringing Illustrator artwork and graphics into Photoshop
Smart Objects

Text Design
Filling text with a texture or photograph
Distorting text around a curve and typing on a path, or within a path shape
Creating drop shadows & emboss and other effects on text
Copying layer styles to other layers or images

Design & Montage
Create a lightened image to go behind text
Fading an image out to solid colour
Producing a tinted photograph or a Duotone image
Creating a vignette effect or a border around an image
Creating designs by blending together images, text and artwork
Create a photo montage or build a panoramic image from 2 or more photos
Design a simple web site banner or simple poster/postcard design
Use either scanned artwork or illustrator artwork, select areas and fill with solid colour, textures or photographs

Filters For Artistic Effects
Creating textures
Creating a line art effect from a photograph
Using lighting effects and motion blur filters to add depth to an image

History Palette
Using the History Brush to restore parts of an image after making changes

Web Images
Correctly re-sizing images for use on web sites – avoiding blurred images
File types and compression settings – the correct ones to use
Optimisation and exporting images for web sites

Paths
Using the pen tools for creating and modifying paths
Editing and saving a path with an image
Converting a path into a selection
Save a clipping paths with DTP applications

Vector Shapes
Creating vector shapes using the built in shapes
Creating customised shapes or using a shape created in Illustrator
Changing the colour of a vector shape
Modifying a vector shape

Actions
Recording a series of steps to be performed on a number of images
Naming, editing, saving, loading and running actions
Batch processing a complete folder of files

Saving and Output
Creating a contact sheet from a folder of images
Saving, exporting and using Photoshop files with other applications

There is may be too much here for most people to cover in enough detail in just 2 days, so you may wish to select the areas that you need most and spend more time on those areas.