Looking for an SEO service or program that:
 

Will check the position of your site in the SE's, on a regular basis. Weekely etc.

What would you expect to pay for this?

Be careful if you opt for a software program to do this, Yahoo (and its properties like altavista, alltheweb, etc) and Google are both very picky on limiting requests, especially to scripts or bots.
WG

what he said --- a lot of people end up on the shitlist because of that

Any idea how they limit them Requests about a specific domain. Requests from a specific ip??

Use very little known cloaked proxies and store the data locally, poll once a day

try this one. it's free. you specify keywords and URLs.

http://www.digitalpoint.com/tools/keywords/

Yahoo API is limited to 5000 requests per day (up to 50 results/request) and Google's API is 1000 per day (up to 10 results/request), *I believe*, I could be off.

Doing direct searches on the engine (not via API) is even less. Google will OCR your results, but its still useable, Yahoo will just give you an error and you have to wait it out.

Results and throttling is IP specific, yes.
WG

Google's API is 1000 per day (up to 10 results/request) is correct
I dont use yahoo, so I cant confirm that

The Google one I wasn't so sure on, the Yahoo one I just wrote a script for their API so that one I'm pretty sure is correct. I know though that the Yahoo API is restricted by IP so getting multiple keys does nothing. Google's I think could be circumvented with multiple keys, even on the same IP. I'm not sure though.

WG

OK thanks for the help.