Phaedrus said:
I am by no means an expert, ...
Mobility, Shot on the Run, and the one that negates AoO's for using missile weapons in threatened areas (can't remember the name).
Do NOT take shot on the run or mobility. Shot on the run can't be used with anything other than a single attack, multi-shot, rapid shot, etc... do not work with it. If you want something to improve mobility, mounted archery kicks ass. You can get off a full attack while your mount gets a full move. Far better than shot on the run.
There is no (non epic) feat for negating AoO's when using missle weapons. Order of the Bow Initiate (OoBI) gets this as a lv2 class ability. The ranger spell Arrow Mind, from "The Complete Adventurer" goes one better though and actually lets you threaten the normal 5' area around you. There are a number of GREAT ranger spells for Archers in "The Complete Adventurer". Exotic Weapon Master (from "The Complete Warrior") can take as one of their weapon tricks, the no AoO ability as well as some of the other marginal bow weapon feats like ranged disarm. Nominally you have to use an exotic weapon for this class, but you might be able to talk your DM in to just letting you blow a feat to make your bow "Exotic". There is an exotic bow, the Greatbow in CW D10 dam 20/x3 crit. However it is too large to be used while mounted, a restriction I would prefer not to have.
Ranger makes a good base for an Archer in 3.5 with the archery based skill path, you also get a number of nice skills and abilities like track, move silently, listen, hide, spot, that you wouldn't get as a pure fighter.
Improved Initiative has become a favorite feat of mine. With your dex and the +4 from II, you can pretty much guarentee you'll go first. If you have any sneak attack dice, this will also let you catch them flatfooted at the begining of combat, so you can get your sneak attack damage on your arrows (within 30').
Unfortunately, there really aren't any good Archery PrCs in 3.5. OoBI, got nerfed as their Precision shot ability is next to useless. Arcane Archer requires that you be an elf (ugh) and has lost much of its reason for existance with the changes to DR in 3.5 and the loss of bow and arrow bonus stacking (thank you all the whiners). Furthermore, in my experience the bonuses that you get from AA, are inferior to that you'd get from Greater Magic Weapon.
One possible PrC is the Kensai from Complete Warrior. They don't gain any specifically archery related abilities, but do get to enchant their bow on the cheap. You get a couple of not especially good class abilities as well, but basically you get to put a +1 enchantment on your bonded weapon per Kensai class level, with the usual +5/+5 max enhancement/ability max.