there must be some reason you're pondering it!
You're running XP so obviously you'd benefit as even with 512 megs of ram for me winXP can seem a little sluggish every now and then.
I run photoshop and all that other crap and do a lot of audio editing, so I don't know if you do these things too or not, but winxp warrants 512megs of memory IMHO...