I didn't see anyone referring to "bio" as an acronym, Bill. People were quite correctly referring to "BIOS" as an acronym. (I'm not sure what it stands for, but I believe the "OS" is for "operating system"--sorry, Philip.)

For exactly the reasons you mention, I hardly ever correct people's grammar here, but I made an exception for something that was part of the page, not part of the discussion. Once in a while I also correct lyrics for spelling and word choice, because those are going into the archive where lots of people will see them and may be misled by them. (For instance, Hank Williams's "Jambalaya" is in the DT, and how many people will think "filet gumbo" has to do with fish filets instead of filé powder? Though this may be Williams's error.)

And if I may be allowed one more digression into alt.usage.english--I agree completely with the rule Dick Greenhaus gave for the plurals of acronyms (and abbreviations and initialisms).