caudor
Adventurer
DDI, as others have said.
However, I did want to keep my books updated so i bought a bunch of those punch-hole-sized red stickers and put them next to rules that have been updated. That way, when you see a red dot, you know to check the updates (should you be referencing a book instead of DDI).
Kind of like these (only smaller)...
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Great idea with the dots. What I've been doing is making a little mark in my books where errata applies. That way, I know when to look up an errata if needed.
I do hope we'll see some kind reprinting of the rules with the errata included (not all the books, just the core).
I've seen mention of some kind of 'Essentials' products that are supposed to include the errata, but I'm not up to date on it yet.