I came across this post on ZDNet:
http://www.zdnet.com/5208-10535-0.html?
forumID=1&threadID=14939&messageID=299498&start=-28

The post itself is not important, it is the way FB is mentioned in
this post and in the other posts for this ZDNet article. We are on
the public radar, we have made *major* progress during 2005.

I did some googling and was confirmed in this view:

firebird 5,800,000 hits
postgres 4,030,000 hits
firebird database 1,760,000 hits
postgres database 2,290,000 hits
firebird sql 1,640,000 hits
postgres sql 1,710,000 hits

So it seems that our Google footprint has pulled up to a similar size
as Postgres, which is fair to both communities I think, even though
our installed base is 10x larger.

The next targets to beat in terms of Google footprint are DB2,
SQLServer, MySQL and Oracle, in that order:

db2 database 5,560,000 hits
db2 sql 4,170,000 hits
sqlserver database 18,100,000 hits
sqlserver sql 34,600,000 hits
mysql database 44,100,000 hits
mysql sql 21,400,000 hits
oracle database 46,000,000 hits
oracle sql 23,400,000 hits

So, let's be happy with what we have already achieved and then move
on to double our footprint to match db2. Last May we already figured
out the mantra: "capable, compact, easy, community, free"; all we
have to do is repeat it time and again.

My own homework on Google footprint for 2006 is clear:
EnterpriseDB 154,000 hits
Fyracle 15,000 hits
Maxdb sql 715,000 hits

Paul