Enabled auto redirect to non-www domain. Please report if you see some errors.

No, and likely never be possible! The business model of Daily Bitcoins requires motivating users to stay on the page as much time as it possible before taking prize, but UNDO button will reduce average time spent.

I have received a suggestion and implemented search capability for the shortened links.

Charging fees from incoming payments (i.e. deposits made by advertisers) is very bad idea. Advertisers, not publishers create income stream for the CoinURL and if they feel any inconvenience, it could have negative impact on the revenue.
Currently I am trying to get enough income by forcing publishers, who withdraw funds, to donate some share to the service.

Right now CoinURL is located on the virtual server with dynamic resources (total 16 CPU cores and 12 GB RAM) for about $20/month. If there is little load on the hosting's server from other customers, CoinURL shows excellent performance. But in some days (absolutely randomly, occurs about 1 time per few weeks) overall load on the server becomes extremely high and hosting's administrator imposes temporarily limits for me (he told that other hosting's customers complain for the poor performance and they have no other choice that limit resources for me, because CoinURL is the most resource-consuming site they host). In this case you see this annoying "max_user_connections" error.

I tried to measure performance on the dedicated XEN VPS with single core 2.4 GHz and 1 GB RAM. Result: very far from enough!

If I would start accepting non-Bitcoin users, I expect growth for tens of times in short time, server resource consumption most likely will rise so dramatically that $10-20k mainframe will be required.

Right now profit margin is VERY FAR from be enough to hire employees.

My closest goal is to raise enough fund to purchase physical server and I am trying to save as much Bitcoins as I can.

What do you mean?

I don't impose restrictions on the sites advertised, non-Bitcoin advertisers also welcome!

When I will start accepting other deposit options apart Bitcoin, there will be much more different advertisers. But this is not easy from many points: technology (most likely number of publishers will increase so high that only physical dedicated server will be able to handle load), legal and personal (I have little free time for next few months).

Inexpensive ad slots available on Daily Bitcoins Payments page!
https://bitcointalk.org/index.php?topic=120138.0

Quote becomes invalid when you refresh or open main page in another tab (http://dailybitcoins.org/index.php).
Prize is attached to the session, so if you open main page in the different browser previous quote will not be invalidated.

We would like to offer new ad slots on the Daily Bitcoins Payments page!

160x600px
https://operationfabulous.com/advertiser/index.php?e=site_page&wid=1071

468x60px
https://operationfabulous.com/advertiser/index.php?e=site_page&wid=1072

Starting bid for each slot is just 0.01 BTC/day. You banner will displayed on both address input form and results page.

Another reason why some users have received prizes with the value different to displayed on the image:

If you have opened new tab or browser instance with dailybitcoins.org URL after seen an image with prize and before clicked "Send" button, this prize will be invalidated. The prize in new tab becomes valid.

You see only this concrete ad because advertiser have chosen some keywords present on your site or selected your site to advertise exclusively. Don't worry, CPC of targeted ads guaranteedly will be higher than network-wide.

While CoinURL don't have any non-Bitcoin advertisers, this filter is useless.

On which page it happened?

I know. But too many use of include_once can cause some performance penalty.

Fee is being charged by Bitcoin network if you spent small prizes too soon. If you wait few days or bundle many transactions (on Daily Bitcoins it is possible now) you will not have to pay any fees.

A mutex have been implemented in the prize displaying script. Now you guaranteedly will receive the same prize that was displayed on the image.

Feel free to report if problem still persist.

It is already implemented. Just sent me an e-mail and your account will be deleted.

Unfortunately problem with hosting still persists...

It is also possible.

We are experiencing temporary problems with the server. Don't worry!

UPD: Seems issue solved now!

When I need to lock some cheater account I do exactly as you said - set NULL password, which makes impossible to ever use this account.