Emailed a version of this off to a local taper recently and thought I'd add it here. My full clamp setup:
I use a variety of clamping gear depending on the situation. All in all, I use my clamping gear more often than my mic stand. Here's what I use (almost all available at B&H Photo -
www.bhphotovideo.com - best source I've found, though not always super cheap for little stuff like thread adapters):
Windtech Multi-Position "C" Clamp
Mfr # MPC10 | B&H # WIMPC10
I use this one for clamping to other tapers' stands. Compact, lightweight, flexible with 2 different orientations for the mic thread stud. I couldn't get by without one. I have several, and always carry them with me.
Bogen SuperClamp
Mfr # 2900 | B&H # BO2900
This is the clamp I use for latching on to railings, posts, tables, chairs, shelves, pipes, ceiling beams, light fixtures...damn near anything other than a mic stand. Bigger and heavier than the MPC above, uber-robust, wide jaws. Comes with standard 1/4"-20 male threaded stud (see below). For short rises or adjusting orientation (the stud mounts in only one orientation, unlike the MPC above), I use either the Heavy Duty Flex Arm or Mini-Extension arm (see below).
Bogen SuperClamp Standard Stud (with 1/4"-20 male thread)
Mfr # 2908 | B&H # BO2908
Comes with the Bogen SuperClamp above. Requires a 1/4"-20 female > 3/8"-16 thread adapter and a 3/8"-20 female > 5/8"-27 male thread adapter before using with standard 5/8"-27 female microphone / stereo bar threads. See below for adapters.
Bogen Extension Arm for Mini Clamp (works with SuperClamp, too)
Mfr # 203 | B&H # BO203
Great for extending short distances from the SuperClamp, and for adjusting orientation. I went without one for a looooong time, using only a (non-Bogen) gooseneck extension. Now, I have both. I think one or the other will suffice for most purposes.
Bogen Heavy-Duty Flex Arm
Mfr# 237HD | B&H# BO237HD
Basically just a robust gooseneck extension (like the kind available at a local musicians' store - which I originally used - but beefier). Includes the appropriate bottom end needed to slot it into the SuperClamp. The mic end of the extension has a 1/4"-20 male thread, just like the SuperClamp's standard stud above, so it, too, requires adapters in order to attach a standard 5/8"-27 mic thread. I use this mainly with my Schoeps actives, not sure if it's beefy enough to run full-size mics & shockmounts.
Arca-Swiss Thread Adapter (1/4"-20 female > 3/8"-16 male )
Mfr # 809011 | B&H # ARB.2538
This isn't the exact one I bought, but I can't remember the manufacturer / model / retailer of mine.
Windtech Thread Adapter (3/8"-16 female > 5/8"-27 male)
Mfr # M3 | B&H # WIM3C
This isn't the exact one I bought, but I can't remember the manufacturer / model / shop of mine.
A.P.I.C. Custom 3-Section Extension Pole (28"-78", 5/8"-27 male/female threads on appropriate ends)
The piece de resistance. I use this in conjunction with the SuperClamp all the time. I use it regularly at at least half a dozen or so local venues to run my mics up/down/out/beside my clamping space in order to achieve a more optimal mic location. Custom, though, so it's not cheap - ran me around $75 if I recall (had it for years). Gets more use than my Bogen 3373 mic stand. Bogen makes a couple extensions like this, but none as long, and I've found them difficult to track down online. A.P.I.C's phone #: 201-261-2160. They also make mic stands, but I prefer the Bogen mic stands. If you order a custom extension from these guys, they'll want specs on number of sections, closed length, open length, and make sure you tell 'em you want 5/8"-27 adapters on each end - female on the bottom, male on the top. I'm ordering a new 4-section extension soon, so I still get the ~80" of reach but can close it more compactly to fit on my motorcycle. And I already have 3 people in line for my old one when I sell!
Alternative extension pole:Bogen / Manfrotto 3-Section Extension Pole (35" - ~92")
Mfr# 099B | B&H# BO099B (thanks to macdaddy for the heads up that the previous referenced mode, 3019, was discontinued and replaced with this one)
Looks like it has a 5/8"-27 female thread on the bottom, according to the specs on B&H. Has a combination 5/8" stud and 3/8"-16 male thread tip on the top. Much less expensive than the custom APIC extension (by about half!). Wish I could fit a 3' pole on my motorcycle more easily, I'd save myself a few bucks.