I've written some irb tutorials you might find handy:

http://tagaholic.me/2009/05/11/demystifying-irb-commands.html
http://tagaholic.me/2009/05/29/exploring-how-to-configure-irb.html

Some irb-related gems I've released:

hirb (http://tagaholic.me/hirb/) - Pretty print ruby objects as
tables, trees ...
bond (http://tagaholic.me/bond/) - Custom autocompletion for an
object's methods, a method's arguments and more
alias (http://tagaholic.me/alias/) - Configurable aliasing for
methods, classes, constants and more

Gabriel

Martin DeMello wrote:
> Other than installing wirble, what ought I be doing to enhance my irb session?
>
> martin