If you don't, you may find it difficult or impossible to prove title and avoid boundary disputes down the line.
The period for registering your land is stated to be between June 17th, 2008 and September 30th, 2008. An extension extended that period to October 31st, 2008, and an "unofficial" extension is said to be in effect until the end of 2008.This very short window is likely to be extended as the bureaucracy becomes overwhelmed - they are planning to go out on strike to commemorate the first day of the period - but for your own protection, you should get your documents in during this initial period. Otherwise, you may lose your rights to your property.
This is especially crucial for older properties which have not gone through any sort of title search as they have changed hands. Just because your family has "always owned it" that won't confer any protection on you during this new process.
This land registry process applies to both Greeks living in Greece, and anyone else who owns property in Greece.
Those living abroad have until December 30th to register their land, but my sense is that earlier claims may prevail in case of disputes, so don't wait until the last minute. And keep notarized copies of any documents submitted in support of your claims.
The official Land Registry website in English is ay http://www.ktimatologio.gr/ktima/EN/index.php but this does not give a step-by-step process for registering. There are on-line forms in Greek at the Greek version of the website: www.ktimatologio.gr. Those in Greece can visit any of the 76 official Land Registry offices in the area where they own property. If you need to travel to Greece for this, allow plenty of time for your trip. They anticipate over 3 million claims to be filed, which is far beyond the current capacity of the offices to process.
The daily English-language newspaper eKathimerini is publishing articles on various aspects of the process and its problems, so you may want to search their site for updates.
Note: Please be especially cautious of any offers from anyone to "help" you register land in Greece. If you need assistance, contact a known and trusted lawyer or other professional.
Some readers have reported that the registration situation is still up in the air. Official information is contraditory, and many areas seem to have different requirements, but the websites listed above are a good place to start.

