All of them, just in the last year or so.
SA604A/SA614A was a fave, although not as nice as the late lamented MC13155.
BITD I used to use the RSSI outputs for all sorts of stuff--even some of the micropower chips would give megahertz detection bandwidths if you ran the RSSI output into a very low impedance, such as a biased cascode or fast TIA.
You can still get the TL026 AGC amp, the SA571 compandor, and allegedly the MC1496, but all the nice NXP and onsemi oscillator/mixer and IF amp/limiter ones are gone,
There were things you could do with those for $2 that are much harder now. I still have lots for lab protos, but in the scheme of things I'm less likely to use them since they'll never make it into an actual instrument.
A pity.
Cheers
Phil Hobbs