What is the easiest way to filter Mobile traffic

Htaccess would be best.

Send me an email, Ill hook you up.

mixup few methods so you can filter all traffic

Yes .htaccess is the best way IMO

Check out the new Blog of Sexgoesmobile. There you will find some scripts and instructions (geo filter, web/mobile filter).

.htaccess or javascript redirect...

.htaccess redirect is bad for search engines, G. don't like it at all, java redirect script is also bad for SE at some point...php doing it just fine.

Source or personal experience that google doesn't like the htaccess redirect?

Here you'll find more infos:
http://www.sgm24.com/category/mobile-redirect/

We have evaluated PHP vs. .htaccess vs. JavaScript with a lot of our affiliates.

A PHP redirect is officially recommended by Google.
Here Google's official statement: http://www.youtube.com/watch?v=hK6wf7CBYS8

Our webmasters haven't seen any punishments by redirecting via .htaccess

Within 2 days a lot of webmasters lost their pretty decent Google ranking by redirecting via JavaScript.

Also not all devices (especially older ones) do support JavaScript.

we use a php script.

Google doesn't consider most of the sites we think as mobile, as mobile... smart phone sites aren't mobile sites to Google.

So your redirects, aren't seen by Google bot, it hits the normal site like any normal surfer would.

Just like Google wont nail you for filtering off a type, source, location, country of traffic, they won't hit you for mobile redirects.

Most of us aren't masking the mobile site over the same url - which would mean the content is expected to be the same then. If you do, your content needs to be the same, otherwise it's like any other source of traffic being sold off.

The Mobile Google Bot looks for Wap sites, the same with mobile sitemaps are for Wap sites. Google considers Wap mobile sites, to actually be the mobile site.

.htaccess will redirect the most people.

Php is the next best, end of the day the person has to connect to it, to connect to the mobile site.. and the more connections you make on a mobile device, the less chance you have of making the redirect.

Javascript is just bad, bad for seo, bad for redirects, and should only be used as a last resort where you can't use .htaccess or php files.

I don't understand what you are saying here. Do you mean the content should be the same as the page mobile users are diverted from, and the content be served from the same domain to keep google happy?

This isn't served content or where it's linked, this is content in the idea of what they're looking at overall, as an entire site.

If the person is on Domain.com and is redirected to m.domain.com or the same domain but in mobile, then the root site and mobile sites are related enough... The content sizes, text, ads, ect will be slightly different, but the overall nature of the site is the same or the content is related.

It's when you try to trick the bot or people, that it becomes an issue. Showing them different content pages than what you would get normally, like they're looking for free porn and you give them nothing but paid or keyword stuffed pages. Something totally different....

grab redirect codes over here http://www.signbucksdaily.com/sites/list/show/mobile/