Don't let anyone tell you can't take any pictures through glass doors ...
Keep the glass clean (the missus loves me!), take the pictures level, and try to get of any internal reflection by shutting doors and turning lights off etc.
This squirrel picture from my non RSPB blog was taken through patio doors: http://www.blipfoto.com/entry/1941536, as was the pictures before it (the magpie, the carrion crow and the blue tit) ... of course you get better ones when taking them without the doors, but if you know how, you can still get decent images.
If you keep to a good feeding routine the birds will get used to you, the starlings were queuing up yesterday whilst I was putting food down .. no more than six feet from me! ;o)
I bought a wireless remote trigger a fortnight ago to try and get some close up shots without me being out there ... it's not stopped raining since, so I've not been able to use it! ;o)
You can always turn to technology to help with shooting through Glass ;)
[Ant, I know it's from 7DayShop again, but I'm not on a commission LOL, just have the link on speedial in the browser ;)) ]
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I've shot all the pictures of the birds in the garden through the doors, they are still skittish if they see me getting too close. They must be getting more confident though as I have just looked and there were about 10 all gathered on the lawn and feeders. The 2 blackbirds (male and female) and a number of sparrows. As soon as they saw me getting close to the window they were off. I did shut the curtains either side of where my lens was pointed yesterday and noticed the reflection of the back of the curtain was affecting the image so moved it away again. Other than that it's not been too problematic so far. Maybe I'll build a hide in the corner of the garden, haha.
Tom to answer your original question I would have been down for the Waders meet today but have to go to London - new granddaughter to see!