Hi there!
Double Glazing - like previous posters said, they're window units that are specially made to have the glass panels made from two layers of glass with air sealed between to provide more effective heat insulation. Other benefits include better security and noise reduction. Of course like anything, the quality can vary tremendously! but at it's basic level Heat & sound insulation are the biggest advantages.
Fitted Kitchen - Yes, I agree with Otterpop. A 'Fitted' kitchen is one thats had the worktops, base and wall units 'fitted' to the availalable wall/floor space so as to make the maximum usage of area & space. Invariably though, when a kitchen is 'fitted' the fridge and cooker are included as part of the project - so it's easy to see how the term fitted has been drawn out to include those items.
As a landlord, I provided my flat fully furnished, so it was in effect fully 'finished' - this would include things like Kettles, microwaves, toasters, some cutlery and plates, cleaning and maintenence equipment etc etc. Quite alot of agents told me to only leave the basics, ie get rid of the cutlery and plates, remove things like ornaments and nic nacs etc - which I did for my place. Any places you want to view, ask the agent/landlord what's included and if of course you have your 'own' stuff, ask him/her if they'll take away their stuff.
HTH!
Cheers! Dennis! West London Slough UK!!