Yeah, I remember "Wishing On A Star" ... thanks to Mr. Dorman!
What about...
"10-9-8" Face To Face
"World Dance Party" The Fools
"Anywhere With You" Rubber Rodeo (I think WHTT used to play that one)
Sunny Joe White made these staples on his show: "Searchin'" by Luther Vandross, and "Together In Electric Dreams" Giorgio Moroder
Kiss played "Wildflower" (it was a remake) by Color Me Badd around 1994 or so, but IIRC the song (well, the Color Me Badd version) never even cracked the Hot 100
I'm sure there were a few New Kids On The Block tunes that Kiss and ZOU played 'round here that never charted nationally (can't think of any of the top of my head, thank goodness for that!

)
Not sure if "Hole Hearted" by Extreme charted nationally (although could have been a top ten hit for all I know lol), though I know it received a lot of airplay around here- who could forget that video with The Boston Bruins, great stuff 8)