There are three kind of GM bloggers. GM bloggers of the first kind copy pictures or links and say, oh, this is awesome. GM bloggers of the second kind create useful new stuff for other GMs to use. I like to think that I oscillate between the first and the second kind, depending on the inspiration of the day.
Then there are GM bloggers of the third kind (no, they're not humming aliens). GM bloggers of the third kind also create useful new stuff, but it's stuff that can be expanded, improved, and customised, not mere one-off stuff.
The kind owners of the Last Gasp blog definitely pertain to the third category. They have created not a generator, but a tool that enables fellow GMs to create generators (a meta-generator?).
Here's a sample generator that I have created in 2 seconds using their Choose Your Own Generator tool.