This is Scytodes velutina - a spider that belongs to the Scytotidae family . It has a common name: spitting spider. It has slow movements and hunt during night when the preys are "sleeping". When the spider is near the prey, it spits silk and glue to grasp the prey (the spitting is in zigzag mode).
Here you can see an image with about 3:1 magnification. The prosoma of this spider is rather dark.
See careful the first pair of legs with many hairs so the spider can sense its preys. You can see really the claws in legs. And you can see clearly that the spider is grabbing with the claws a silk thread.

i suggest you see it bigger here:
http://farm1.static.flickr.com/186/3991 ... a171_b.jpg
no worries: this spider is not dangerous for us.

Jorge Almeida