Linux distribution to support OLD hardware

Reading about all of the old hardware (TOXINS) being dumped in our landfills is really getting to me. I was thinking that with Linux maybe I could help keep this hardware out of the landfills for a few more years. What I'd like to do is take really OLD hardware (as old as Pentium 100, 32 MB RAM, 500MB HD configurations) throw on a lightweight version of LINUX and give it to groups needing basic Internet-word processing computing (library's, schools, day care centers, etc.). OpenOffice and FireFox support would be great but any version of Linux supporting a NIC, a modem, ISA video, Sound Blaster compatible sound, and a web browser capable of viewing graphical content would work just fine. I've installed Windows 98 on such hardware and it works fine for the above needs plus it will run old Windows-based educational software for kids. The problem of course is the Windows licensing. I'm guessing 98 still costs about a $100. I don't mind spending some time configuring the systems and delivering them to various groups but I don't want these group nor me to pay MS $100 per machine. Also I'd like to get some really cool looking "Powered By LINUX" stickers-logos to stick on the boxes. And one last thing, has anyone seen educational software running on LINUX?

TIA