Surf any of marketing forums, and you're almost certain to see posts about membership sites. Marketers are asking if their idea is a good one, how to control access, how to integrate billing, and so on. Why all marketer interest in membership sites, as opposed to say affiliate product sales or releasing their own products?

The main reason is probably also main benefit of running a membership site - and that is an ongoing monthly income from subscription payments. If a marketer builds membership levels, monthly income will also increase, thus increasing financial reward for little increased effort. With a good membership site, owner can maintain a steady, fairly predictable income regardless of other projects.

Without question, cockroaches are truly one of nature's most amazing and enduring creatures. How amazing? Read on.

Cockroaches are thought to have originated 0ver 280 million years ago (during Carboniferous era).

The world's largest roach (which lives in South America) is six inches long with a one-foot wingspan.

Cockroaches bleed white blood.

Cockroaches have 6 hairy legs. The tiny hairs found on each leg gives them their sense of touch.

Cockroaches can hold their breath for up to 40 minutes and spend about 75 percent of time just resting. There are an estimated 5,000 species of cockroaches worldwide.

Some female cockroaches mate once and are pregnant for rest of their lives.

You've no doubt heard legend of headless cockroach. Well, in this case, legend also happens to be fact. A cockroach can live a week without its head. The roach only dies because without a mouth, it can't drink water and dies of thirst.

Cockroaches can run up to three miles in an hour.

Young cockroaches need only a crack as thin as a dime (about .5mm wide) to crawl into. Adult males can squeeze into a space of 1.6mm or thickness of a quarter. Pregnant females need most space to hide: 4.5mm or a space as tall as two stacked nickels.