Hi,
I also own a Mac Mini 1,5Ghz 64 Mb vram, and it's very slow...I can't download at more than 20-30 kb/sec
with OWB or wget.
I tested with lot of host : youtube, fab's free server, speedtest, and many others.
I don't have this problem with my Mac at the same time.
I change ethernet cable & hub slot. reboot.
Always a poor speed.
if you wish I can do a video.
Thanks