Folder Structure
It has taken me a while to find a Folder structure in Lightroom which allows me to logically structure and find my photos but now I have it.
Metadata - Fixing Missing Dates
Lightroom has a great Metadata browser which allows you to see your images sorted by date. It uses the EXIF "Date Time" field to do this.
Turn on Filmstrip Ratings
Here is a tip which will let you show additional detail in the Filmstrip in Lightroom.
Visual Keyword Usage Indicator
Lightroom allows you to assign keywords which is great for quickly finding images by simply clicking on the keyword in the "Keyword Tags" section of the left hand Library module.
Use the Lightsout Mode
The Lightsout mode in Lightroom is a very easy to use and powerful way to view and isolate images.
Thumbnail Icon Tricks
Thumbnails in Lightroom will show one of three different icons in the bottom right hand corner.

Use Typographic Fractions
Try turning on the Use Typographic Fractions setting under the in the Interface section of Lightroom's preferences.
Use Virtual Copies to avoid duplicating images
Lightrooms Virtual copy capability is really powerful. If you want to produce image variations, say a black and white ....
Quick Keyword Entry Using the Alt Key
Lightroom shows keywords as sets which can be customized, as in my set of Rivers keywords below...
Lightroom keyword entry
Lightroom virtual copies
Lightroom typographic functions
Lightroom icon tricks
Lightroom lightsout mode
Lightroom fix missing dates
Lightroom folder structure
Lightroom filmstrip ratings
Lightroom keyword usage indicator
The New Synchronize Folders Function
At last Lightroom now has a fully functional and working synchronize folders ability...
Lightroon Synchronize folders
Turn off 'Auto Hide and Show'
When using Lightroom in it's default mode the interface is set to "Auto Hide and Show" the side panels. ...
Lightroom auto_hide_icon
Use Lightrooms Full Set of Quick Develop Tools
When you are working in the Library Module using quick develop, make sure you toggle the little black triangles ...
Lightroom quick develop tip

LIGHTROOM - LIBRARY MODULE TIPS AND TRICKS

Delete Old Backups to reclaim GBs of Disk Space
I prepared this tip following a question which was asked in the Image-Space Lightroom Forum. I backup my lightroom catalog regularly ...
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Toggle the Toolbar
I was working in the Library Module the other day and I could not remember how to change the size of the thumbnails in the Grid view ...
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Import both RAW and JPEG images
The default setting in Lightroom is to ignore additional JPEGs which are stored in the same folder as the RAW files. So you will have to import manually ...
Lightroom jpeg raw import
Display Exposure Bias on Thumbnails
If you blend exposures, or shoot multiple shots, prior to making HDR images determining which are the correct sets of images to blend ...
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Use Auto Advance to Speed up Rating, Picks and Flags
If you want to speed up the rating and flagging process try turning on Auto Advance setting in the Photo menu ...
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Fix Lightroom Auto start when Memory Card Detected
Lightroom should automatically launch and display the contents of memory card or other connected device such as a camera ...
Lightroom autostart tip
Use the Asterisk to Keyword Partially Key-worded Image Sets
There is a quick and easy way in Lightroom to ensure that you have applied the same keyword, or set of keywords, to a group of images. ...
Lightroom autostart tip
Relocate the Lightroom Catalog to another Disk
I often get asked 'How do I move my Lightroom catalog from one disk to another and keep all of my ratings, edits and keywords'. ...
Relocate Lightroom Catalog Tip
Color Label Sets
I would guess that most people do not use Color Labels. They can be very useful ...
Lightroom Color Label Sets Tip