The misuse of 'infamous.'
A little excerpt of that description for you: "The infamous 'Touching Evil' series from the USA Network (summer 2004) starring Jeffrey Donovan and Vera Farmiga (among others). Cancelled after one season apparently due to lack of viewership. As anyone will tell you, this is a good show. Highly watchable, even just the one season."
Let's ignore the erroneous and annoying assumption that everyone knows it was a good show, and focus on the misuse of 'infamous.' People do this all the time and it drives me nuts. I'm not sure what they think they're saying when they use it incorrectly, but from the context in this case, 'infamous' is definitely not the proper word.
Let's look at the definitions according to dictionary.com:
infamous [in-fuh-muhs] –adjective
1. having an extremely bad reputation: an infamous city.
2. deserving of or causing an evil reputation; shamefully malign; detestable: an infamous deed.
—Synonyms 1. disreputable, ill-famed, notorious. 2. disgraceful, scandalous; nefarious, odious, wicked, shocking, vile, base, heinous, villainous.
—Antonyms 1. reputable. 2. praiseworthy, admirable.
famous [fey-muh s] –adjective
1. having a widespread reputation, usually of a favorable nature; renowned; celebrated: a famous writer.
2. Informal. first-rate; excellent: The singer gave a famous performance.
3. notorious (used pejoratively)
—Synonyms 1. famed, notable, illustrious. Famous, celebrated, eminent, distinguished refer to someone or something widely and favorably known. Famous is the general word: a famous lighthouse. Celebrated originally referred to something commemorated, but now usually refers to someone or something widely known for conspicuous merit, services, etc.: a celebrated writer. Eminent implies high standing among one's contemporaries, esp. in one's own profession or craft: an eminent physician. Distinguished adds to eminent the idea of honors conferred more or less publicly: a distinguished scientist.
—Antonyms 1. unknown, obscure.
Famous people: Harrison Ford, Jennifer Aniston, George Washington, Trent Reznor...
Infamous people: Adolf Hitler, Osama Bin Laden, Ted Bundy, Billy the Kid...
So to sum it up: Famous=Good and Infamous=Bad. And judging from the "As anyone will tell you, this is a good show" part of the description I quoted above, the writer liked the show (and the show didn't have a bad reputation) and therefore shouldn't have said 'infamous.' I wouldn't have used 'famous' either, maybe one of the synonyms of 'famous,' but not 'famous' because it wasn't popular enough to stay on-air, so it certainly wasn't famous.
The only thing I can think of to help remember the difference (if you don't just know it) is to remember something about how it is GOOD to use as few letters as possible, and since 'famous' is shorter than 'infamous,' 'famous' is good and 'infamous' is bad. That's all I got. Other ideas are welcome.
While we're sort of on the subject, 'notorious' means the same thing as 'infamous' and should only be used in a negative sense. Please do not use either 'notorious' or 'infamous' in a positive way hoping to be ironic. Doing that in writing just doesn't work. Here you go... 'notorious,' 'infamous,' and 'negative' all have Ns, so they are similar. That could help with remembering, also.