Dear Miss Snark,
Write a novel. Rewrite it. Write a rough query letter. Edit novel. Edit letter. Get both critiqued by people trusted to be harsh, though not cruel. Write synopsis; edit twice. Narrow list of agents from all in existence to only those who handle your genre. Edit novel again. Edit query again. Get picky over the details. Hand it off for a second reading. Prepare a dozen SASE's. Go back to agent websites and double-check you won't be sending your Fantasy work to an agent who specializes in Horror.
Am I allowed to be horrified, and cross agencies off my list, upon seeing that they misspelled words? And not just any words- one agency has a side bar with things such as "Query Guidelines" "Recent Work" and "Apperances", spelled just that way. I'm obsessing over details, and... *shakes head and tosses KY a bone*. Yes, they represent my stuff, have AAR membership, have sold things recently- including something that's similar to my book- but they don't care enough about appearances to spell the word right on their main site.
Agent nitwits, or should I overlook it?
well, I'm not objective, given I've had spelling errors on my site too.
It's not the end of the world.
And a lot of times, the agency website isn't maintained by the agent and/or it's a pretty low priority.
No excuse I know.
My vote is to overlook it. Whatever you do, don't mention it in your query letter, not even to be funny.