All those meanings linguistically not too far from the Mirriam Webster listing:
"Main Entry: 1show
Pronunciation: 'shO
Function: verb
Inflected Form(s): showed /'shOd/; shown /'shOn/; or showed; show·ing
Etymology: Middle English shewen, showen, from Old English scEawian to look, look at, see; akin to Old High German scouwOn to look, look at, and probably to Latin cavEre to be on one's guard
transitive senses
1 : to cause or permit to be seen : EXHIBIT
2 : to offer for sale
3 : to present as a public spectacle : PERFORM
4 : to reveal by one's condition, nature, or behavior
5 : to give indication or record of
6 a : to point out : direct attention to b : CONDUCT, USHER
7 : ACCORD, BESTOW
8 a : to set forth : DECLARE b : ALLEGE, PLEAD -- used especially in law
9 a : to demonstrate or establish by argument or reasoning b : INFORM, INSTRUCT
10 : to present (an animal) for judging in a show
intransitive senses
1 a : to be or come in view b : to put in an appearance
2 a : to appear in a particular way b : SEEM, APPEAR
3 a : to give a theatrical performance b : to be staged or presented
4 a : to appear as a contestant b : to present an animal in a show
5 : to finish third or at least third (as in a horse race)
6 : to exhibit one's artistic work
- show·able /'shO-&-b&l/ adjective
- show one's hand 1 : to display one's cards faceup 2 : to declare one's intentions or reveal one's resources
- show one the door : to tell someone to get out
synonyms SHOW, EXHIBIT, DISPLAY, EXPOSE, PARADE, FLAUNT mean to present so as to invite notice or attention. SHOW implies no more than enabling another to see or examine . EXHIBIT stresses putting forward prominently or openly . DISPLAY emphasizes putting in a position where others may see to advantage . EXPOSE suggests bringing forth from concealment and displaying . PARADE implies an ostentatious or arrogant displaying . FLAUNT suggests a shameless, boastful, often offensive parading .
synonyms SHOW, MANIFEST, EVIDENCE, EVINCE, DEMONSTRATE mean to reveal outwardly or make apparent. SHOW is the general term but sometimes implies that what is revealed must be gained by inference from acts, looks, or words . MANIFEST implies a plainer, more immediate revelation . EVIDENCE suggests serving as proof of the actuality or existence of something . EVINCE implies a showing by outward marks or signs . DEMONSTRATE implies showing by action or by display of feeling ."

Having in mind that languages evolve and no language stays the same, we must agree that the newer use of the word show leads towards some type of a flaunting spectacle (among other predominantly entertaining values). So much more is the troubling Yahoo's choice of words when ot their homepage they post:
"Slideshows

Asian Tsunami Disaster Slideshow
Jenita Jeyarajah, 25, right, the woman who claims to be the mother of the infant dubbed 'Baby ..."

I know first hand of foreign language where "show" is almost exclusively some staged event of a most entertaining value (usually with songs and dance). All I can say, as the future visitor to that show is: Happy, happy, joy, joy.