I have seen a lot of ads and services online that provide the facility to get higher page ranks on search engines. But when I asked about those services on Google their respond was not much positive because they said it can decrease you page rank (because those services cannot be trusted always). It is happening because the page rank is depending on page visitors (as Google say). So the better way is to let the Google to index your site by sending them the address of your website. http://www.google.com/webmasters/ : here you can improve the traffic with the webmaster tools and you can send your website contents also. It is a legal, simple and direct hit.
You can send your web site address (even the blog) to Yahoo: https://siteexplorer.search.yahoo.com also. It helps them to index your pages on their search engines.
It is better to come up with the content and services which are really useful for the visitors and the traffic will be increased regularly. I have gone through a lot of experiments on increasing my blog traffic and at last I thought to write about the things that are useful for the visitors and then the rest will be done.
I think this way will be slower but much safer and strong than letting other services to do it quickly. And at last these services are free.