Cingular and T-mobile both are based off of GSM and both of them have EDGE wireless broadband coverage in Seattle so they are identical. This is because technically both of them offer the same exact speed for data plans:

http://askville.amazon.com/offers-BlackBerry-data-service-Seattle-Cingular-T-Mobile/AnswerViewer.do?requestId=1097777

The prime difference would be therefore only because of the number of towers that each service provider has in Seattle.

However, it is important to note that Cingular offers a higher speed solution called UMTS/HSDPA in selected major metropolitan areas. In these coverage areas you'll enjoy 400 to 700 Kbps bandwidth on average with bursts up to 1.8 Mbps. Elsewhere, Cingular uses the EDGE and GPRS service like T-Mobile.

In order to get an appropriate summer job at Seattle, WA, you should have your resume in place:

http://job.anythinggoesinc.net/Seattle-Summer-Job.shtml

When looking for information on the internet, always start with your search keeping smaller and more focused websites in your mind. The internet and focused websites will give you specific information related to summer jobs. You can try to get a list of the local companies from the employer websites.

In order to get information related to some of the employer websites, you can seek information by visiting different websites such as Academic 360, Hospitalweb, Bankdirectory.net, Business.com.

Academic 360 can help you with the employment sections of colleges and universities in USA. Hospital web is a directory of hospitals buy state in USA.

Similarly, Bankdirectory.net can give you information on the directory of banks in USA and Business.com is a searchable directory of businesses, etc:

http://www.bankdirectory.net/