I've done Search Engine Optimization on the main site, and you'll see we rank very high (something like 6 on Google) for 'cyberpunk rpg'.
Johnny has a google adwords campaign running, and I also have one that I put money in when I have extra.
I have also put some money into ads on mudconnect.com from time to time.
I have an ad up on all pages of MudVerse.com for the past three or so years.
There are various other sites I've put stuff on, but today I went through the top 20 or so Google results for 'Cyberpunk RPG' and did my best to get our name on the sites if it wasn't there already (which, in some cases it was).
If they had a forum, blog, or contact form, I let them know about Sindome. �Below is a copy of what I did:
E-mailed blogger - kuoi.com/~kamikaze/Cyberpunk/RPG.php
Added Sindome to List of Cyberpunk games on Wikipedia - http://en.wikipedia.org/wiki/List_of_cyberpunk_works#List_of_computer_and_video_games
Commented on Amazon.com Cyberpunk game - http://www.amazon.com/Cyberpunk-2020-Roleplaying-Game-Future/dp/0937279137
Created page on RPG.net Wiki - http://wiki.rpg.net/index.php/Sindome
Purchased 25k impressions on rpg.net - http://www.rpgnow.com/product_info.php?products_id=17721&it=1
Posted comment on - http://www.androidpolice.com/2011/05/12/review-cyberlords-brings-cyberpunk-rpg-action-to-android/
Submitted URL to http://boingboing.net/
If you want to spread the word, then by all means, Google a popular cyberpunk term (Ex. 'cyberpunk' , 'cyberpunk game' 'cyberpunk roleplaying' 'neuromancer game' or some such thing) and submit Sindome in whatever way you can!
This will help out our SEO, but also drive traffic to the site and hopefully to the game itself.
If you have any suggestions on how we can better spread the word or advertise, both monetarily and non, post it here.
If you need a banner for a site, you can use this one: http://www.mudverse.com/listings/1237427959banner_468x60_1.gif
Hot link it if you want, I ain't give ah fuck all.