Installing IBM DB2 v. 8.x on Linux without X11
IBM DB2 v. 8.x uses a Java based GUI for installation hence the requirement for X11. If you have a Linux box without X11 installed you can install DB2 manually which isn't as diffecult as it sounds.
Sametime login issues
We had Sametime logon issues at a customer site where users could logon for an hour or so before logon being denied. The issue turned out to be with the configuration as it most often turns out.