General Advice
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If you want more customers then spend more time on-duty.
Players take note of prompt service and of those who are never available.
Regular customers tend to automatically ask people who they know will almost certainly be available.
The more time you spend off-duty, the more customers you will lose.

Offering the taxi free of charge when significantly delayed presents you in a good light.
Most customers will still pay anyway, they may even tip.

It is not uncommon to have no requests in 3 hours, nor is it uncommon to have 5 requests inside a minute.
You can carry your pets.
The Blacklist
Bulletin Board
Clubrooms
The Committee
Honour Roll
Location Suggestions
Foreign Currencies.
It is your choice whether or not to accept them.
Take note that you are just losing custom if you won't take a currency form.
Djelian coins can be changed at the Morporkian Embassy in Djelibeybi or at any money changer outside Agatea.
Lancre coins are easily disposed of by depositing to the Cooperative bank. 3% in OC, 2% in Lancre.
Rhinu are a pain in the neck, but they do add up.
Gold rings and Ruby rings can be blorped and sold to playershops.
Fences
99% of the time fencing an item will gain much better returns than selling to a general shop.
Clothing fences are Shifty Jim in Ankh-Morpork Thieves Guild and Tiffany Glitter in Pekan Ford.
Jewellery fence is Sol who wanders about in Ankh-Morpork Thieves Guild.
Weapons fences are Jak Raplin in Troll's Head Bar and Dodgy Bill in Mad Stoat.
Charm Bracelets The Badge
syntax taxi -  gives the list of badge options.
taxi emote <string>
taxi members
taxi archives
taxi list [discussion item] <id>
taxi withdraw from <id>
taxi vote for <choice> in <id>
taxi resign as <position>
taxi disbar <member>
taxi history
taxi recruit <player>
taxi announcement
taxi resign
taxi talk <string>
taxi archives [list] <number>
taxi list all [discussion items]
taxi nominate <person> in <id>
taxi brief name <brief name>
taxi brief {on|off}
taxi mute {on|off}
taxi info
taxi members {online|listening}
These handy little items can be purchased from a shop on Okra Avenue in Northern Genua.
A bracelet can hold up to 15 charms each weighing 1/9 lb.
While bracelets no longer let you save on burden, they are an extremely efficient and variable means of storage. There is a huge variety of charms available in gold, silver, ruby, sapphire, emerald and obsidian, then diamond. They range in price from 5 to 9 livres depending on material. The shop has rotating stock so you might have to come back many times if you are after a specific charm.
Add <charm> to <bracelet>
Remove <charm> from <bracelet>
Blorple Management
Always label your remembers/blorples.
Small label 25p from some stationers.
engraving $1 per 5 letters
embroidering $1 per 5 letters
Scolorid's Scintillating Scribbling

Write/scribble on paper with quill.
Keep

keep <item>
keep <item> in <container>
unkeep <item
>
This command helps you avoid selling something by accident.
Defunct if item leaves your inventory.

Identify

identify <item> as <xxxx>
identify <item> in <container> as <xxxx>
unidentify <item>

Identify allows you to isolate one item out of many similar items.
Defunct if item leaves your inventory.
eg. identify gold ring as drum.
locate drum
The gold ring (worn) (keeping) ("drum") is in your inventory.
remove drum
You remove the gold ring.

Alias

alias drum get drum from belt;cast Jogloran's Portal of Cheaper Travel on drum;put drum in belt
Condition
condition all damaged
condition all in clothes damaged

Containers

Assassins utility belt: 24 rings,
Thieves pocketed leather undershirt: 20 rings
Ninja leather armband pouch: 8 rings
Assassins small shoulder pouch: 7 rings
Order robe: 15 rings
BP Wizard's Guild custom robe: 24 rings
Backpack: lots of rings
Other clothing, etc
.
Jogloran's Portal of Cheaper Travel
The following advice is general and is based on observation rather than research.
Still, I hope it proves useful.

GP cost: 100
Magic.spells.misc is the main factor in determining how long a door will remain standing.
Magic.spells.misc is the main factor in determining how long it takes to cast.
Magic.methods.spiritual.banishing is the main factor in determining accuracy.
High bonuses in all the methods will significantly reduce casting time.

In general bonuses in excess of 200 are required for reliable casting.
A bonus in excess of 250 in banishing will reduce the likelihood of misportals to roughly 1 in 10.
Burden has a major effect on likelihood of misportals. Note: burden itself, not the -1 dex.
High background thaums will increase the likelihood of misportals and other fails.
Banishing will TM well from 150-200 bonus and easily from 200-250 bonus.

You can 'look enter door' to see if a door is to the correct location.
Indeed, when Taxiing it is required that you check the accuracy.

Rumbling doors will explode if you attempt to enter, closing the portal.
Burning doors can be entered but can deal significant damage.
Anything from 30hp to over 500hp per touching of the flames.
Touching the flames includes opening, closing, pushing and entering.