There hasn't been a lot for me to do recently, so for the last month or so I've been farming creds. This is my setup:
I take over the Waterfront in Gang Warfare, enabling the "Choosing Crates" noncombat. I spam for Omnitech convenience store crates, which have a lot of junk (good for gang stash) and cred chips.
To minimize the amount of time I spend beating people up in PvP to unlock this adventure, I just do this every 4 days. In the days in between, I craft consumables and pick up smuggler/other 1/day stuff.
For food, I'm using Ika sashimi. You can get this from crafting endangered squid with a sashimi knife, and it works out well because you can get endangered squid from smuggler's crates at the Waterfront. This means that while you're farming, you can be picking up raw food ingredients. With 40 hunger, I get ~160 energy, without Ocean Sight. I hazard it'd work out even better with it.
For drugs, I'm using cut Nova. This is also, conveniently, available from Smuggler's crates (Nova + Caffeine powder). I get about 100 energy per 36 body (because of cyberware).
Over the course of the ~285 energy I get every four days, I can rack up about 60 Omnitech crates, for about 12k of credits and about 300 each of Omniwatches, Moist Cookies, and Protein Bars. In addition, I run Shakedown in the Waterfront, which I think nets me about 4k. Keep in mind I'm maximizing the chance of choice encounters, because they take 1/5th the energy of combat. This is about 16k creds per 4 days=4k per day.
Now of course there are requirements for this kind of farming: I have the stats and equipment to easily take control of the Waterfront with minimal energy investment, and the materials to have a ton of base drugs and food. But if you can consistently take control of the Waterfront I think you can execute this as well.
Now for the economic implications: unearthly coins, as far as I can tell, run for 40-45k in the mall. This means that you can get an unearthly coin every 2 weeks or so, which should be enough to pick up the new item every season. Of course, this doesn't leave much energy for spading :(
As a bonus, I've realized that the mounds of old coins and Omnitech rubbish scores for large amounts of cred not due to value but simply by mass. I think I've made about 30k on old coins I never used in the last week.
How do all of you farm? Do you have any suggestions to optimize my strategy? Will posting this thread raise the prices of Unearthly Coins?