ITASOR said:
Try iCab. I think it's even still updated, even for the older OS versions!
iCab is indeed still updated. They've only very recently dropped
68K development! Unfortunately, iCab is notoriously rife with compatibility issues. (Makes hash of a lot of modern CSS).
Here is the Sonnet G4/500 daughtercard for the WallStreet. Panther is faster on a WallStreet than Jaguar, and is very nimble and responsive with this card. (As long as you stuff it with RAM). I never got around to putting Tiger on mine so I don't know how well Tiger performs on a WS. To install Panther you need to use XPostFacto, and you need to install Panther before installing the G4/500 daughtercard (or you need to swap back to the stock processor for the duration of the install, at any rate): something about the accelerator screws up your ability to boot OS X from CD, which the installation procedure requires.
As
Racer X says, you need to partition the HD (unless it's actually 8 gigs or less). The OS X has to go in the
first 8 gigs, not just
a partition of 8 gigs or less. You can put all your applications (except the Apple-branded ones that come with the OS) on a different partition, they don't need to be in /Applications.
If you're thinking of going with a new hard drive, consider the Toshiba 7200 RPM 60-gig, or the newer 100-gig. Those things are
fast. I think I got almost as much performance boost from running a pair of those (the second one in the expansion slot as
Racer X describes) as from the G4 card!
The RAM slots: there are two SO-DIMM slots, both of them on the processor daughtercard, one on top and one on the bottom. To swap the one on the bottom you need to pull the daughtercard out of its socket. I got my RAM from Data Memory Systems: a 256 module for the top and another for the bottom (the one on the bottom has to be "low-profile" and they are a bit more expensive).
Graphics: Can't replace the stock video, nor can you add any video card that
performs any better as far as I know, but you
can acquire a CardBus card (PC Card) that will let you run a second monitor as an extended desktop. There are two vendors that I know of: Margi Systems makes a card called the
Display-to-Go, which I did not buy and don't know much about (EDIT: looks like it's discontinued); and the higher-end
VillageTronic VTBookDD card, which I did buy and have been very happy with. (I use it now on my G4 17" PB to drive a third screen).