Lonely Planet Eastern Europe
This Lonely Planet guide offers practical advice on independent travel in Albania, Bosnia, Bulgaria, Croatia, the Czech Republic, Hungary, Macedonia, Poland, Romania, Slovakia, Slovenia, and Yugoslavia. This edition contains over 150 detailed maps of countries, regions, cities, villages, updated historical and political background notes, useful words and phrases in 10 languages and details on border crossings, visas and local currencies.

While this book covers fewer countries, each country is covered in great detail.  If you are primarily traveling in  the Eastern region of Europe, then this is just the book for you.

Lonely Planet Europe On A Shoestring
Coverage: Albania, Andorra, Austria, Belgium, Bosnia-Hercegovina, Britain, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malta, Morocco, The Netherlands, Norway, Poland, Portugal, Romania, St Petersburg, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and Yugoslavia (Serbia & Montenegro).

Covers 40 countries and over 160 maps. 1296 pages

The first ever Lonely Planet to cover all of Europe.  Finally, Lonely Planet makes an all in one guide.

Let's Go Eastern Europe
Covers Albania, Belarus, Bosnia-Herzegovina, Bulgaria, Croatia, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Macedonia, Moldova, Poland, Romania, Slovakia, Slovenia, Ukraine, Yugoslavia, Berlin, Helsinki, Vienna, Istanbul, Russia, Beijing, and the Trans-Siberian Railroad. 65 black and white maps and 4 color maps.

Let's Go books do provide lots of good information, but do not have as much in depth coverage as Lonely Planet guides. 

Lonely Planet Central Europe
This Lonely Planet guide offers practical advice on independent travel in Austria, the Czech Republic, Germany, Hungary, Liechtenstein, Poland, Slovakia, Slovenia, and Switzerland. Included is a language section with useful phrases in German, Czech, Hungarian, Polish, Slovak, and Slovene of color photos. 130 detailed maps.

While this book covers fewer countries, each country is covered in great detail.  If you are primarily traveling in  the central/eastern region of Europe, then this is just the book for you. In fact I used the previous edition of this guide on my recent trip to central/eastern Europe. Very helpful.