Tantalums are still usable for some applications, such as timers on one-shots, etc.  Also when doing bypassing, each type of cap exhibits certain behaviors at particualar frequencies so a mixture of ceramic, OsCon and tantalums sometimes provide the necessary response curves across all domains.  OsCon types are really good for low ESR and bulk capacitance.  MLCC ceramics are also excellent for lower ESR but generally do not provide the massive bulk capacitance required for some applications such as switching power supplies.
 
Watch the dielectrics tho for your applications.

		
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