Folks, did a little research into the Nike Range as I didn't understand all the names - Thought I'd share my findings - Ignore the promo style words, most is copid and pasted from a running review blog, but the principles are quite clear! 
LunarElite
The LunarElite replaces the Air Zoom Elite. Thought as a lightweight racer/tempo trainer, it offers less support than the LunarGlide:
Best for:
Runners in search of a lightweight shoe with a very comfortable upper, a springy heel cushioning and some mild support for over-pronation.
LunarGlide
It is the most supportive of the Lunar family. First shoe to introduce the Dynamic Support which consists of a softer foam contained into a harder shell.
Best for:
Neutral to mild over-pronating runners in search of a very lightweight run. At 10.7 oz, the Lunarglide is lighter than most light support shoes.
LunaRacer2
At only 6.7 oz. the Lunar Racer 2 is the evolution of the Lunarlite Racer, the best selling marathon racing shoe for 2009. Runners are amazed by the amount of springy cushioning in sucha lightweight package. Support offered, though, is very very limited so not the ideal shoe for everyday training, especially for over-pronators.
Best for:
An extremely lightweight racing shoe, for neutral to under-pronating runners.
LunarSwift
The LunarSwift is a takedown of the LunarElite. This means that it has the same design/engineering DNA but at a more affordable pricepoint. There is no FlyWire and the shoe weights slightly more at 10.2 oz.
Best for:
Runners looking for a moderate supportive lightweight tempo/racer shoe at an affordable price point.
Nike LunarFly
Introduced in October 2010 as a replacement for the Nike Run Avant. The LunarFly+ is a well cushioned, light weight daily trainer for efficient runners that also does a nice job for speed and tempo work. Could also be used on race day. Weight 9oz (250gr) Recommended for Neutral runners
The LunarFly is a “jack of all trades” shoe…daily trainer for some, tempo/speed shoe for some and racer for others, but overall a very solid shoe at a very reasonable price.
Nike Lunar Eclipse+A new and exciting addition to the Lunar range, the Eclipse+ features an innovative design that will adapt to give you the right level of stability and cushioning whether you have a neutral gait, under pronate or over pronate.
'Nike LunarEclipse+ = great cushioning + great (and adaptive) support.'
the LunarEclipse+ is softer than the LunarGlide+
So, for example, if you’re currently running in a premium stability shoe but wish it offered a softer, smoother ride and/or lighter weight, chances are good you’ll love the LunarEclipse+. The LunarEclipse+ is also a great choice if you’re currently running in a premium cushioning shoe, but wish it offered just a bit more support—if even only in the last few miles of your long runs.
Edited: 25/05/2011 at 08:32