Besides using Google Page Rank to check for a website whether is reliable, I sometime also use WHOIS service to check the owner's detail who registers the domain.
You can use any type of WHOIS services available and I recently found this website - www.scamadviser.com that has a better user friendly of WHOIS service. It is similar to the normal WHOIS services with additional "Trust Rating" feature. It indicates whether this website is at high risk or safe but I think you still need to make your own judgement.
For example, I key in "softwaretracker.blogspot.com" to this website and I get the rating of 40%. Yes, not very good rating but is completely safe!!! :)
To see more detail reasons of such rating, you can click on the "Summary". You will see the notes mentioning "This is a generic (most likely free) website using the site blogspot.com". You can also look for the "Analysis Details" to provide further explanations which also include some recommendations to you. After that you make your own judgement whether this domain be trusted.
Well, I usually do these 2 steps to investigate a website. First step is Google Page Rank and second step is WHOIS but sometimes I skip the second step especially it has a high page rank (i.e. > 5). If a website has 0 page rank and indicate as high risk in ScamAdviser, it is probably a scam website. Good luck!