Jay, the Fuji S2 Pro was the only Digital camera (that I know off) that really did TTL by doing a film protocol mimic, all other had to change the TTL language and protocol due to preflash issue, so in a way, yes the D300/D300s does TTL, but nowaday it requires a TTL converter (translator) to get the message across and for this you will need digitally compatible strobes (in other words new strobes, cause your SB one O fiver are way too old for the new toys) or you can go with optical fiber triggering, you will need compatible strobes, so in other words, given that I suspect you have SB 105, if you want optical TTL then again its a pair of new strobes to add on the shopping list, or you can simply try your hand at shooting manual, at least in the beginning until you are ready for a pair of new strobes and a TTL converter.
I shoot the D300s and have both a pair of TTL strobes with a converter and a pair of optically triggered strobe, I do have to admit liking the optical connections for their simplicity, ease of maintenance and how compact the strobe package can be compared to classic set up.