So this beauty has been in my 'need to ID bin' for a while. However, the bin is almost empty, and this little bugger is still in there. Any help would be greatly appreciated. AR denarius 15mm 2.42g. Could it be: Julia Domna with Juno reverse? ie. this one (RIC IV 560)
Well, when I saw saw the obverse of your coin, my brain immediately shot out "Julia Domna", so you can take my gut reaction for whatever you think it's worth. The Juno reverse seems plausible to me, too.
Julia Domna probably, but I think the reverse shows a cornucopia. Perhaps something like this: There are several variations of a reverse with a standing figure holding a cornucopia, so this may not be the exact match. Take a look on http://www.wildwinds.com/coins/ric/julia_domna/t.html
There are several possibilities featuring a standing goddess holding a cornucopiae in her left hand on coins of Julia Domna. However, many of these were made at branch mints (Fortuna, Felicitas) or are quite scarce (Liberalitas). The most likely possibility is Hilaritas, either the one such as @Bing showed above, or with children at her feet (I think I see some blobs at either side of the deity's feet on your coin. Julia Domna, AD 193-217. Roman AR denarius, 2.84 g, 18.5 mm, 6 h. Rome, AD 208. Obv: IVLIA AVGVSTA, bare-headed and draped bust, right. Rev: HILARITAS, Hilaritas standing facing, head left, holding palm branch and cornucopiae, children to either side. Refs: RIC 557; BMCRE 34-36; Cohen/RSC 79; RCV 6587; Hill 985; CRE 350. Notes: ex AMCC; ex Spartan Numismatics.