I'm sorry to hear that you didn't find this to be sufficient notification and spent time looking for the show - that's definitely a bummer.
Just wanted to share what I usually do: around 10:30-11ish, I usually quickly check the boards, twitter, and facebook just to check if there's any new news. That's how I saw that today's episode was cancelled, and I was able to rearrange my schedule (having that extra hour actually really helped me stay ahead of schedule!). It's something you might want to consider for the future - a quick check of the boards a little before the show to see if a cancellation is mentioned.
I get that its disappointing when you're expecting the show and it doesn't happen, but sometimes cancellations happen last minute. It's just the way life goes.