You should definitely try XnView, available at www.xnview.com
(donīt mind the .com, itīs freeware).
Itīs available for many platforms (Linux x86, Linux ppc, OpenBSD x86,
NetBSD x86, FreeBSD x86, Solaris Sparc, Solaris x86, Irix mips, HP-UX,
AIX and MS Windows).
I was using it on Windoze first, where it replaced ACDSee for me and
now am happy with it on Linux (~1 year of use).