If your JPEG is good quality, you can get a film-like photo at most normal photofinishing retailers (including Walgreens and Walmart). If it’s bad, the quality of printing isn’t going to help it.
For me, bang-for-buck, I think Adoramapix does a great job. I normally print stuff at home on my Epson R1800 (which, in my opinion, produces better quality prints than I’ve gotten from film), but if I want to send something out for serious high-quality printing, I go to Portland Color, but they are pretty expensive.
I would recommend a print service like mpix.com over Walgreens/Walmart/etc for anything other than snapshots. The prints I’ve sent to local printers suck compared to the same shots printed by mpix.
And if you’re a Sam’s Club member, they also offer the service, and they did an excellent, one-hour job for some snapshots. I’ve never tried them for “serious” photos, though.
If you’re lucky enough to use a Mac OS X computer, then the iPhoto built-in service (via Kodak) does an excellent job. The largest I’ve printed there was 8x10. The only drawback with using iPhoto and other online services is the lack of instant gratification and/or the requirement to have forethough.
I just replaced my nine-year-old DeskJet, and I’d thought that it was excellent for photos. Well, it was, but just not as excellent as the new DeskJet. If you hold the paper at odd angles, you can sometimes see some ink texturing, but other than that, they have the feel of photolab photos; the same paper on the older DeskJet felt (but didn’t look) “grainy.” If you discount the price of the printer (i.e., consumibles only), it’s actually cheaper than the lab services.