All great ideas... but I wanted to stress ...
TRACK LIGHTS< TRACK LIGHTS!!!
Can easily move the light if you change furniture around a little and they are fairly inexpensive. Can usually find some at flea market/garage sales too.
Colapsable/movable work surface is handy in my room as I am limited in space. I have extra set of "TV" trays that I move around for another surface when I need it.... Not super steady, but nice for like my laptop when I need to have next to my machine.
My sewing room is guest room, so everything colapses or can be moved to loft if we have guests.
One day I SHALL HAVE DEDICATED SEWING ROOM!! (I can't have garage as this is my husband's domain!)
Good Luck!!!