Multiple domains still valueable?

[Geebee]

Hi, we use a second domain to serve our static images. We do this mainly because 'in the old days' some browsers had a maximum of 2 parallel connections. Nowadays, modern browsers have 6 or more:

http://www.browserscope.org/?category=network&v=top

Is it still wise to have a second domain for images or should we forget about that and dismantle this solution altogether? We will save ourselves the second DNS-lookup...