TradeList is a very basic mod that lets you do a simple command to see the tradeskill links for other guild members that are online and have the mod installed.

Usage: /tradelist [/tl] <tradeskill> [off|offline] [skill] [>channel]

The tradeskill can be one of these abbreviations:
alc: Alchemy
bs: Blacksmithing
enc: Enchanting
eng: Engineering
ins: Inscription
lw: Leatherworking
tail: Tailoring
jc: Jewelcrafting

If 'off' or 'offline' is specified then offline members are shown as well.

The skill is an optional numeric value which will remove people with less skill than what you specify. If skill is omitted, 0 is used.

Channel can be used to redirect the output: 'raid', 'party', or 'guild' can be specified, or another player's name.

You can do '/tradelist all' to see all tradeskills.

Slight technical detail: there's doesnt seem to be a way for a mod to get your tradeskill link unless the window is open so you won't broadcast your tradeskills to other players until you've opened your windows at least once (at which point the mod will cache your link).  Similarly, if you learn a new skill other players won't see it until the next time you open your window.