Therad, I was going to mention Honey Radio but you beat me to it!
OT, but do you know when WJR-FM went from the oldies/currents mix to Beautiful Music, which they remained until they became Hot Hits WHYT in 1982? I know it was Beautiful Music by 1974, because an Ann Arbor radio station list from that year lists them as B/EZ.
It is also worth pointing out that WHND continued to sound like a "first generation" oldies station until the very end (which came in about 1994 when the station went Spanish; it's now a religion-talk station owned by Crawford). They played lots of deep cuts and pre-Beatles and very limited post-1965.
www.whnd.org is a tribute website run by an Email penpal of mine who was a devout Honey Radio fan.
In Ann Arbor, Clear Channel brought back the "Honey Radio" name and WHNE calls (the WHND calls now belong to a public radio station in Sister Bay, WI) in 2002 to AM 1290. Playlist-wise, the "new" Honey Radio focused on 1955-1970 mostly, not nearly as deep as the original Honey or as WSAI was with its Real Oldies approach, but still with a good quotient of "oh wow" songs. The station has since become WLBY, an Air America affiliate.
In regard to oldies on Top 40 stations, of course, The Big 8 CKLW, while not all-oldies, did the Million Dollar Weekend thing and released several oldies albums. Many Top 40 stations in the 60s and 70s released oldies albums - WKNR Keener 13 had its "Keener Gold" collections as well.
Going farther back to the late 50s/early 60s, WJBK had special jingles to introduce oldies ("Flashbacks" as they called them), and I've read that Joel Sebastian on WXYZ had a weekend all-oldies show called "Movin' Memories."
Also, Detroit in the late 70s had Tower 92 WTWR (now WMXD), which was sort of an Adult Top 40/Oldies hybrid.
I believe Detroit's first "second generation" all-oldies station was WKSG-FM (Kiss 102.7), which lasted from about 1984 to 1991. 93.9 in Windsor also made several attempts at oldies during this time, twice as CKLW-FM (with formatics that recalled its AM sister, the Big 8) and once as CKMR "More 94." But WOMC 104.3 went oldies in 1989 and trounced them both, and has been oldies since. Recently CKLW's sister station, CKWW 580 AM "Motor City Favorites", went from Gold-Based A/C to oldies of the 60s and 70s, and sounds great. Also there's CFCO 630 AM in Chatham, Ontario, which has been playing oldies since about 1991 or 1992 and can be heard easily in the Detroit area.
There is still one oldies station in the Detroit area reminiscent of the "first generation" approach, and that is WPON 1460 AM in suburban Walled Lake (Oakland County), which has a playlist very similar to the old WHND, including deep cuts, minor chart entries, and Detroit-only hits. They also stream, at
www.wpon.com. However, they also run a lot of ethnic programming, especially on weekends.