I’m frightened by how many of these songs exist in my iTunes library. 
Some of the most often mentioned “one hit wonders” of the 80s did indeed release second singles which, in many cases, were superior songs. 'Til Tuesday’s follow up “Looking Over my Shoulder” was far better, IMO, than the cloying “Voices Carry.” A-Ha hurt themselves; there was so much notice about groundbreaking rotoscope animation in the video for “Take On Me” that people burned out on it. When they went back to rotoscoping for “The Sun Always Shines on TV” people didn’t pay much attention, and the single did nothing on the charts, either. All of Swing Out Sister’s debut album “It’s Better to Travel” was terrific, it just wasn’t pop, and therein was the rub; people expecting 12 tracks like “Breakout” had to be disappointed by songs like “After Hours” which were straight up chanteuse-nightclub modern poppish jazz. They’re still together and recording. Their latest album “Where Our Love Grows” comes out on October 19 and the tracks I’ve heard sound great, and are more in that light jazzy-pop genre.
Actually it was written and originally recorded by the late, great Kirsty MacColl who was a good friend of Tracey’s. Kirsty sang backup on Tracey’s version, and the “Baby!” you hear right after the guitar solo mid-song is actually Kirsty; Tracey couldn’t pull it off successfully (to her own satisfaction) and asked Kirsty to sing it for her. The video, with a cameo from Paul McCartney, is outrageously adorable and kitschy, much like Ullman herself.
One of my favorites is “The Politics of Dancing” by a band called The Reflex who I think would’ve had a greater success if not for the confusion between their band name and the Duran Duran song of the same name.
I also always liked “Digging Your Scene” by The Blow Monkeys, but it may have been the name of the band (and the swanky video for the song) that really caught my attention.
Another favorite is a song that came out in late '89 (just skirting the fine line of 80s one-hit-wonders) called “No More Lies” by a baby-voiced singer called Michel’le. She was, at the time, engaged to a vaguely known rapper who happened to produce her record for her and showed up in the video for the song. They broke up and she faded into obscurity. 15 years later, though, everyone knows her ex, the rapper – Dr. Dre. 
Not only did they only have one US hit, no one in their right minds could say it was their best song. When I pointed out to someone that they released a 14-track greatest hits compilation in the UK, their eyes bugged out of their head.
enipla, Norman Greenbaum’s version of “Spirit in the Sky” was released in the 70s (perhaps even the 60s) but it was released by weird new-wavers Doctor and the Medics in 1985.