First off, I should point out that there are some glaring lapses in my collection; notably, in the D&D line there's a jump from 1981 (Moldvay) to 2001 (Hackmaster--the "Never Say Never Again" of Big D), and only one of the numbered editions are included: the recent Basic Rules associated with v. 5. I'm not a complete Luddite, I do have several of the more prominent knockoffs--Tunnels & Trolls, DragonQuest, SwordBearer--and retroclones--Castles & Crusades, OSRIC, Swords & Wizardry: White Box and Complete, DCC (perhaps more of a knockoff than a retroclone)--on hand. Labia Lords was omitted from the study because, with such a silly name, I just can't take it seriously. Also missing: Mentzer; because I don't have that book.
There are, of course, some basic similarities throughout the majority of the versions. For instance, we all know that haffies are short, ca. 3' tall, they tend to be dexterous, stealthy, and crack shots with various missilery. It's also generally agreed that they tend to be hardily resistant to magic and perhaps also poison--usually manifested in a saving throw bonus--and most of the rules include factors such as these in their descriptions of the pesky little critters.
|"Hey little dude: What's up with your feet?"|
Also, over time haffie hardiness seems to have migrated quite a bit. At first they were resistant to magic, then poison jumped on the bandwagon, in the form of heightened saving throws. Some of this disappeared in some editions and versions, but then, inexplicably it resurfaced in Castles & Crusades and Fiver Basic as fearlessness. This is in shocking contrast to, say, Moldvays haffers who were described as somewhat cowardly. While I am deeply and unabashedly ignorant of post-Gygaxian mainline D&D rules, I have read enough to understand--perhaps errantly--that at some point halflings lost there spot as a default player race to the Kender of Dragonlance; the race that single-handedly ruined everything they touched back in the mid-80s.** Anyway, my point is that I have a sinking suspicion that the fearlessness thing is a kender trait rather than a hobbit trait, which makes me more than a little queasy. On a possibly related note, nothing in particular is said of halfling feet in Fiver.
* The only illustration of a hairy footed haffer in the core AD&D rulebooks that is explicitly linked to halflings is the one in the AD&D Monster Manual.
** Delta Dan has statistically proven that the reason Walter Mondale failed so utterly in his 1984 presidential campaign--winning only 2 states, if I recall correctly--is that the Reagan camp leaked rumors that Mondale was "pro-Kender." More recently, Mitt Romney saw his presidential hopes go up in flames when a photo of him relaxing on the beach beside a now-middle-aged and paunchy Tasslehoff Burrfoot hit the internet.