http://www.linuxgazette.com/issue70/ghosh.html This Linux Gazette article, "Bootstrapping Linux," offers much detail on the BIOS and MBR.
http://www.lostcircuits.com/advice/bios2/1.shtml The LostCircuits BIOS Guide. The site itself is a bit ad heavy, but there is excellent information on various BIOS settings.
http://www.rojakpot.com/freebog.aspx "The Definitive BIOS Optimization Guide," another excellent site with plain-language explanations of many BIOS settings. Useful no matter what OS you use.
http://www-106.ibm.com/developerworks/linux/library/l-slack.html Joe Brockmeier explains the Slackware Linux boot process, which is not so different from SUSE Linux.
http://linux-newbie.sunsite.dk The Linux Newbie Administrator Guide. Very helpful.
http://www.troubleshooters.com/linux/grub/grub.htm "GRUB from the Ground Up," a fine explanation of how to create a GRUB boot floppy and boot it on a disabled machine.
http://www.gnu.org/software/grub/manual The GRUB manual in various formats.
http://tldp.org/HOWTO/LILO.html The LILO Mini HOWTO.
http://tldp.org/LDP/lame/LAME/linux-admin-made-easy Linux Administration Made Easy. See Section 4.8 on booting with LILO.
http://www.linux.com/article.pl?sid=04/05/17/1832239 A brief review of KSysGuard.
http://docs.kde.org/en/3.3/kdebase/ksysguard The KSysGuard Handbook.