High load causing high stales this morning. Please be careful with connecting too many CPU workers. It will be smoother after switching to the new server.
ZodiacDragon84 and DeathAndTaxes, I think those are some very good ideas about advertisements. I don't like ads much, but as long as bitcoin is small I think this could be very interesting for both audience and advertisers. I may not have time to create an automated system for some time, but if someone wants to advertise just contact me and it can be done manually.
P4man, lots of good ideas there. All noted.
Yeah the "issue" went away. Not sure what that was. For the last round BTC & NMC were the same.
BTC and NMC
rounds are not always the same, starting at the same point in time. Sometimes a lone NMC block is created and the current BTC round is longer than the NMC round. It can be confusing when looking at the worker stats.
Id offer no more than 2 or 3 donation levels max. One of them being "donate namecoins".
Yeah, that song is right.

There's a balance to strike though between so complex it's confusing and so simple it loses its flexibility. I think just 2-3 levels is too simple. On the other hand, multiple coin types add to complexity, maybe the perks can require minimum donations of both BTC and NMC to activate.
I think
http://www.humblebundle.com/ does it well. Unfortunately there's no bundle on sale as I write this so you can't play with the payment options right now.
What I'm thinking so far: A new page under "my account" -> "donations and perks" working as follows.
Perks are listed saying what they do and what they cost. There's a button to toggle them on/off. The "VIP" perk turns everything else on in addition to itself.
Donations are listed by cause. There's a + button to add more causes to donate to ("block bonuses", "bitcoin core developers", "bitcoin miners union", and so on). One cause is always listed, the bitminter main donations that give you perks, cover the expenses of running the service, and can maybe one day help me break even.

For each cause there are separate settings for each coin type (BTC, NMC). You have a box where you can type the percentage to donate and a slider you can drag if you prefer that instead. - and + buttons could go down and up 0.5%. Perhaps also a "max" button to automatically set the value+slider to the rest of your income of that coin type (that you haven't already set to donate to a different cause). Also a button to remove the cause from your list.
Turning on perks will make the BitMinter cause adjust up its value and sliders to cover the price of that perk if the setting isn't already high enough. Not sure if turning perks off should auto-adjust down. Maybe adjust down if the donation was set to exactly cover the perks. Also need to auto-disable perks if the donation is manually adjusted too low.
Perks could require X percent donation on one coin type or all. To keep it simple maybe a "pay unconfirmed blocks immediately" perk should require donations on all types and work on all types. Having one for each coin type may be more screen clutter and complexity than it is worth? At least if there are many perks and all are duplicated for each coin type. May have to think of something smart to make everyone happy there.