well, there's a few, but not many that will have the newest software,etc
a DSL-4.4.10 HD install (not frugal) runs low ram.
I had Tinycore-1.4.3/2.0 on 128mb dell that worked good, just limit your apps
to only a few, including Xfbdev.tce for framebuffer lappys
also, if the harddrive is big enough(+4gb) a minimal slack or debian
install would work too
I had slack12.2 on my toshiba 7000ct 160mb ram 4gb hd with XFCE4 wm
I also had debian 5.0 on it with LXDE
both worked well.
so, it really comes down to hd size and how much work/learning you wanna do?