There are a few resources but you will find that browsers are taking advantage of features that are found at the *very least* in 10.2 (mostly 10.3 / 10.4). Many that will still work on 10.1.x are likely no longer being updated. It seems that older versions of Netscape 6.2.x / 7.1 and Mozilla 1.x are the most commonly referenced as useable although Opera up to version 7.x should also be compatible.
There are others that will work but you'll have to find them ^_^. <a href="http://darrel.knutson.com/mac/www/browsers.html" target="_blank">This is an exhaustive list</a> (only some of which will be OS 10.1.5 compatible.
You'll find a large increase in performance by running 10.3/4 over 10.1.5
MacBook 2.0CD, 2GB RAM, 10.5.8
[SIZE="3"]Apple's handling of iPhone apps is quickly souring my taste for apple products. I've aquired a Windows 7 machine instead of the new MacBook as my form of protest[/SIZE]
Most definitely. OSX got faster as the releases went on. 10.1 was the first genuinely usable version of the OS, but the OS get increasingly faster with each revision. I had a G3 b/w and it was noticable snappier with each upgrade even with it's 350mhz processor.
Ah, the problem will be that the 300 Mhz iBook will only have USB (and USB1 at that) and no FireWire, so installing Tiger will be too painful, although there are of course still ways to accomplish it. That's too bad, since Tiger rocks on a 366 Mhz iBook SE (installed via FireWire).