Nelson Bubble Lamp

you can find a lot of great midcentury scandinavian lighting options on ebay. if you want something new i'd suggest the kartell suspension light. i'm thinking in blue.

http://www.ylighting.com/krt-fly.html

The IQ Light is an iconic Danish design that can be configured in a multitude of ways; it's like grown-up Lego:

http://www.flickr.com/photos/visualingual/2437958945/in/set-72157594505190197/

Unsolicited advice here but I think you should get your curtains lined. If they have a heavier liner, they will look alot better during the day since you wont have the big bright shape of the window behind them. It'll also have a more elongating effect on the window.

unsolicited advce, also: if possible, i'd move the sconce down to be a reading light. i'd also put the dresser under the window and maybe put two nice lamps on it. and i'd probably put a heavy curtain on top of a sheer. i don't know if a hanging light would work so hot...but if you did get one, i think this simple one from cb2 would be great, and very inexpensive:

http://www.cb2.com/family.aspx?c=120&f=4773&viewall=1

I second the Eden pendant lamp from CB2. It's simple, beautiful, doesn't break the bank, and fits perfectly into your current decor. I hung it over a small reading area in the corner of my room and have received many compliments on it.

a Nelson bubble!

something like this bent wood lamp from sprout might be nice, and it's pretty affordable.

http://sprouthome.stores.yahoo.net/bentwoodlamp3.html

God I love AT SF!! I really like the bent wood lamp. . . I was kinda thinking that initially

i have another suggestion: get rid of that hideous curtains

I would worry more about getting rid of the bench at the end or the bed, getting a beside table and more pillows