Tsumego and Moyo Go Studio
laptop have draft avatars of two KGS friends
who might be featured in future 'toons.
For anyone that wants to practice tsumego but can't find the spare change for the Graded Go Problems for Beginners series, gobase.org has four similar sets from the Korean Problem Academy which you can practice online. Registration with gobase.org is required but it's free. I've been practicing on these via my old laptop while working.
Also, the KGS Teaching Ladder room features Tsumego Tuesdays at approximately 21:00 GMT. It's during my work schedule so I normally am unable to attend.
Frank de Groot has provided on his blog a movie that illustrates the features of Moyo Go Studio. This is a good way of introducing the product and I thought it was really cool. The movie got a few Oohs! and Aahs! out of me. It's a big download of about 175MB.