 | Danjay Systems - Provides optimization, submissions and paid ranking.
| Daup - Offers website promotion and positioning services for the Italian and European market, as well as marketing consultancy.
| Deadlock Design - Creates meta tags and titles for designated pages, promotes them on search engines. Monthly maintenance and upkeep.
| Decide Interactive - Australia - Internet promotion and affiliate marketing services.
| Defining Presence Marketing Group - Internet marketing company specializing in search engine positioning and placement.
| Demarhill.com - Provides web submission and promotion services.
| Design Corner - Web design firm offering search engine optimization, and hosting services.
| Designs and Services - Provides website optimization and submission services.
| Deuce Deuce Designs - Provides submission services.
| Did-It.Com - Offers submission services and optimization by keywords client selects.
| Digital Age Marketing - Provides search engine placement and website marketing.
| Digital Submit - Offers search engine submission and web promotion.
| Digitel Traffic - Offers search engine positioning and Internet marketing services for midsize to Fortune 500 companies.
| Direct Connections International - Channels traffic to the client website via doorway pages, charges a fee per click. Also offers sales leads and a market analysis.
| Direct Hits - Website promotion and ranking services, customized keyword and keyphrase development and search engine submissions and positioning.
| DISC - Offers website design, search engine optimization, and other forms of web promotion.
| DiTucci - Professional optimization and website promotion, offers a free search engine report.
| DIY-SEO - Ireland-based firm offers search engine optimisation services including keyword research, tag coding, and link-building. From the compilers of the DIY guide.
| DM Consulting - Canadian firm offers search engine optimization services.
| Do It Your Self Submission - Submits URLs to thousands of search engines.
| Do Net Search Engine Placement Services - Provides search engines placement, pay per click campaigns, and site optimization.
| Domain Diffusion - Offers search engine positioning services and Internet marketing.
| Dotcom-Position - Offers search engine optimization plans utilizing tag coding and doorway page generation, and submission services.
| DreamSubmit - Offers site submission services.
| Dr.Meta-Tagz - Offers search engine optimization and promotion.
| DSR1.com - Register and submit your website to over 400 search engines and directories.
| Dynamic Promotions - UK firm specializing in submission to all the major engines and directories.
| Dynamic Web Promotion - Offers web site promotion services and optimization.
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