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We compare Spitzer Infrared Spectrograph observations of SQ-A & SQ-B inStephan's Quintet, Ambartzumian's knot in Arp 105, Arp 242-N3, Arp 87-N1, abridge star forming region, NGC 5291 N and NGC 5291 S. The PAHs tend to bemainly neutral grains with a typical size of 50 - 100 carbon atoms. Theinterstellar radiation field is harder than typical starburst galaxies, beingsimilar to that found in dwarf galaxies. The neon line ratios are consistentwith a recent episode of star formation. We detect warm H2 in SQ-A, Arp 87N1and SQ-B. Using our 8 um images of 14 interacting systems we identify 62 tidalstar forming knots (TSFKs). The estimated stellar masses range from super starcluster (10^4-10^6 Msun) to TDG (~10^9 Msun) sizes. The stellar mass, with somescatter, scales with the 8 um luminosity and tends to be an order of magnitudesmaller than the KISS sample of star forming dwarfs. An exception to this arethe more massive TSFKs in Arp 242. The TSFKs, form two distinct clumps in amid-infrared color diagram. There are 38 red-TSFKs with [4.5] - [8.0] > 3 and[3.6] - [4.5] < 0.4. This populations has significantly enhanced non-stellaremission, most likely due to PAHs and/or hot dust. The second group of 21sources has 1.2 < [4.5] - [8.0] < 3 and [3.6] - [4.5] < 0.4, these colors aresimilar to star forming dwarf and spiral galaxies. The redder [4.5] - [8.0]population tends to have the sources with a rising 8-24 um SED while the bluepopulation tends to contain the sources with a descending SED. The rising SEDis typical of spiral and starburst galaxies with a dominant 40 - 60 K dustcomponent and the declining SED probably indicates a dominant hot dustcomponent.

Star Formation and the Interstellar Medium in Nearby Tidal Streams (SAINTS)