I was able to setup LTSP at my office (20 workstations), but had to use either bootable CD-ROM or USB images to do it. Everything works.

I read about PXE netbooting and tried it a lot, but could not get my server to pass boot images/kernel images to the client using tftpd. I have isc-dhcp3, tftpd-hpa as my services on debian lenny and ltsp 5. Also I have realtek 8139c NIC's and Award Modular BIOS v6 on my clients, and used gPXE/etherboot images from ROM-o-matic.net

Any help/guide would be appreciated.