Weirdnesses about Redhat 7.1 which I had to fix; most of these apply to 7.2 as well.
Sendmail doesn't accept connections from other machines. If you run a mail server on your machine, you'll need to edit /etc/mail/sendmail.mc and add a "dnl" at the beginning of the line:
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')(thanks to this page)
Telnet and ftp aren't on either, regardless of what firewall settings you choose. You can use ssh, and presumably sftp, but if you want to use regular ftp/telnet, you'll have to make some tweaks.
telnet: chkconfig telnet on (see above) should do it.
If you need to build a kernel, the one that comes with 7.1 doesn't compile. Dump it and download a more current one from kernel.org.
autofs worked okay for me out of the box for both /u and /m, but some folks have had to fiddle with it.
There's something wrong with Python, which breaks some outside software packages. If you're considering installing a new Python, beware! printtool and the rest of the print system is now written in Python, and if you change Python you might not be able to print. Instead, install the python2 package that comes on the Redhat powertools cd, which can coexist with the old python.
You might also want to refer to the Redhat 7.0 tweaks.
If this is going to be a home system, you may want to know how to get a modem working under RedHat.