I agree that the jo is used more like a Japanese sword than not - atlthough it is longer than most katana and can be gripped differently due to the absence of an edge. There's probably a lot of instructional books, video, and DVD out there as it is a popular weapon - if one wanted to take a look at jo technique.
With respect to largo mano, however, I don't think the comparison with the jo is apt: largo mano generally refers to technique with a somewhat longer sword or stick than usual that is used one-handed at a longer distance. It is also true that several styles adapt to different ranges with the same weapon; they refer to the long-range techniques in their systems as "largo mano."
It is interesting to note that several FMA's contain techniques that appear to be specific counters to two-handed swords. This is not surprising given the myriad encounters with different cultures that used two-handed swords across the millenia; the Japanese invasion in 1941 was simply the last in a long line of similar encounters (although it was different in scale and impact). There is a famous story of a young eskrimador who was brought to the house of a Japanese officer during the war (his village was occupied by the army) and told to defend himself against the officer's sword attack. The eskrimador blew out the officer's occular orbit with his stick on his first counter and escaped in the confusion to join the resistance.
Of course, the Moro people used the kampilan to great effect throughout their history. I saw an interesting clip recently that showed counters with the kampilan that used tight "rolling" techniques that occured quite close to the body upon drawing the sword. In other words, the large swinging techniques that one might expect with such a weapon are not used (and this is true of many two-handed sword styles that execute precise, small movements with the sword) and the practioner relies instead on the speed, weight, and sharpness of his weapon to achieve a cut within a relatively small arc.
The two threads that Arnisador posted about ananangkil give good information about the subject. I think that one has to distinguish between a relatively
light-weight ananangkil that can be moved around effectively as a weapon and a relatively
heavy-weight ananangkil that is used primarily for training purposes. For examples of the latter:
http://northshoreac.com/san_miguel_eskrima/ananangkil.htm
http://northshoreac.com/san_miguel_eskrima/ananangkil_files/ananangkil.mpg
With respect to the former, light-weight ananangkil (or similar long, two-handed weapon): these would appear to be tools used to carry things (across one's shoulder's, for example) or short staffs that are adapted for use as weapons in a manner similar to other cultures throughout the world. For a list of non-FMA links and sources, see the following:
http://www.egreenway.com/taichichuan/staff.htm
It is of course generally true that the longer the weapon, the greater distance from the opponent. For example, Tapado technique places you at largo mano
range (or greater) simply due to the length of the weapon and the width of its arc. But this begs the question of which sword or stick range is appropriate for counters - largo, medio, or corto? I would argue that each range has its own answers. In largo mano, for example, one would tend to stay outside of range and target the hands or elbows; in corto mano, one would step inside the arc of the tapado to counter(discussion of this takes place on one of the threads that Arnisador posted above).
Best,
Steve Lamade