Yes, you can still access newsgroups through Google, just search for your favorite group, e.g. comp.lang.lisp.

Or eternal-september. Free accounts, although you don't get access to the binaries groups I don't think. I mostly use it for comp.risks, comp.arch.embedded, and some other things like that.

Aoie is another service still around, and is free without accounts.

or you could use the site I built that reads HN/reddit/slashdot and any newsgroup you wish on a webpage. Its free if a little buggy - www.sagebump.com

you need the www