"Or do you guys think that g**gle will change their system completely and those backlinking is no good way for the future? "
I've thought about that very question. But in the end, how else is G going to figure out what sites people find valuable? I believe that G will devalue different types of backlinks, like directories and social bookmarking sites (pligg, scuttle) but they will still have some value because G doesn't know which ones are done by spammers. And there will be a continual supply of new platforms rolling out in the future for putting your links on that G isn't ready for.
I think G knows about all the backlinking programs out there, the real question is, does G care? If enough obvious junk websites start showing up at #1 in G and in turn ruin the high quality of G's search engine, they are going to take a look and see what is going on. I don't think the number of people using Angela and Paul's service is enough to be noticed or cared about. The last I read, G had over 3 BILLION pages indexed, it is easy to hide in a crowd that big.
Just be slow and steady in your backlinking (don't go from no links to 100's in a few weeks or you might just catch big G's eye) until you get a few hundred backlinks, then speed up the process. All your backlinks will count for something - so just be sure to get them from different sources.