If you search availability thru a registrar, your searches are not secure and can be sniffed by them or by others who know how to tap into this. And the registrars don't hide the fact that they can take searched names and post them in the 'other available names' list most of them offer whenever you search a name. I used to get angry back in the days when I used registrars for my searches; I'd search a few dozen names, kull out the best ones and do my research on them afterwards... and literally within one or two hours of my search, a name I wanted would be taken. That would happen a LOT, and where the name was regged so close to your search time you just knew it wasn't a random coincidence. There are many discussions on this in this forum, especially in the 2006 - 2007 years when domain sniffing was really coming to light.
Of course people would say 'you should have regged it right away if it was so good'. But many of us search hundreds or thousands of names per day, and each day discover dozens of good quality names. Takes time to do proper research on each one to tell if we think it will really be worth the reg, and what it might be used for (resellers, end user, minisite, big development, etc.). Further... you KNOW how many of us/you reg names immediately because we're so excited about how good they are... and then afterwards do some research, think on it overnight, get appraisals, and realize the next day it's just not that great. 'Regging it when you see it because you think it's terrific' should NOT be your prime motivation in regging names. As a very occasional thing, only. Research it, sleep on it. - that is, if you did the name search through a secure method, ha ha.
Now I use secure tools for my searches and that doesn't happen, beyond what you would regularly expect with a good name eventually being regged by someone else. Estibot uses a secure system so if you do a name evaluation with them you'll also be checking the name's availability in a secure way; domain name analyzer is another one, a small simple program you download to your machine and it is secure; also saferwhois.com uses a secure method.
Good luck
