We get internet, etc. from Verizon. Not great, but Comcrap is awful. There are also various satellite services like DirecTV and DISH network, but I don't know which ones operate in Frederick because we live in Montgomery County.
I can't think of anything annoying that folks from Illinois do.
Friendliness might offend some of the people who live close to DC. We moved here from NJ 25 years ago and I was appalled at how unfriendly and "too busy" many of the people I encountered were. I'd ask other moms to come over for coffee, try to set up play dates, chat with them outside the school like I did in NJ. Nothing but rebuffs or cold stares. I don't know whether Frederick is different, but I'd like to hope so for your sake.
Also, drivers here have no mercy whatsoever. If you dare to use a turn signal to indicate you want to change lanes, people will speed up just to get ahead of you. Almost nobody except newcomers bothers using turn signals -- I believe they're a government secret.
All that said, you will love how beautiful Maryland is. Make sure you get out to the Caroctin Maountains (the western skyline of the city of Frederick.) especially when the leaves are turning color. Downtown Frederick is also a really neat place to explore.
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